Q&A: What is known about London attack

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Police and forensic officers work near the scene of an attack which has left one man confirmed dead and two people wounded near Woolwich barracks in London Wednesday, May, 22, 2013. Scotland Yard said officers responded to reports of an assault Wednesday afternoon in the London neighbourhood of Woolwich. London Ambulance service said one man was found dead at the scene and two other men were taken to the hospital, with one in serious condition.(AP Photo/Alastair Grant)

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Q&A: What is kno... Police and forensic officers work near the scene of an attack which has left one man confirmed dead and two people wounded near Woolwich barracks in London Wednesday, May, 22, 2013. Scotland Yard said officers responded to reports of an assault Wednesday afternoon in the London neighbourhood of Woolwich. London Ambulance service said one man was found dead at the scene and two other men were taken to the hospital, with one in serious condition.(AP Photo/Alastair Grant)
2011 jail breaks... FILE - In this Wednesday, April 28, 2010 file photo, relatives of the 26 suspected Hezbollah members, accused of plotting attacks on tourists and shipping in the Suez Canal and sending operatives and explosives to Gaza to help militant groups there, waves to prison vehicles carrying them outside Emergency State Security Court in New Cairo, Egypt. It was one of the most perplexing events of Egypt's 2011 revolution: Attacks on prisons that broke out more than 20,000 inmates, among them Hamas and Hezbollah militants and Muslim Brotherhood leaders, including the man who is now the country’s president, Mohammed Morsi. Now a court case is trying to uncover for the first time who was behind the attacks, raising political headaches for Morsi. (AP Photo/Amr Nabil, File)
Japanese climber... A team of climbers led by 80-year-old Japanese mountaineer Yuichiro Miura stand on the summit of Mount Everest on Thursday, May 23, 2013. Miura on Thursday became the oldest man to reach the top of Mount Everest, a Nepali official and Miura's Tokyo-based support team said. The photo was taken with a telephoto lens from an altitude of 5,550 meters (18,208 feet). It is not clear which of the climbers in the photo is Miura. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT
Building materia... FILE - In this Sunday, May 12, 2013 file photo, Bangladeshi soldiers stand amid the rubble of the garment factory building that collapsed on April 24 as they continue search operation in Savar, near Dhaka, Bangladesh. A government investigation said poor quality construction materials and building code violations contributed to the collapse of building housing garment factories last month in Bangladesh. (AP Photo/Ismail Ferdous, File)
Japanese climber... In this May 22, 2013 photo distributed by Miura Dolphins Co. Ltd., 80-year-old Japanese extreme skier Yuichiro Miura, left, uses oxygen mask and his son, Gota sips green tea as they take a rest in a tent at their South Col camp at 8,000 meters (26,247 feet) before their departure for Camp 5 during their attempt to scale the summit of Mount Everest. Miura, who climbed Mount Everest five years ago, but just missed becoming the oldest man to reach the summit, was back on the mountain Wednesday to make another attempt at the title. (AP Photo/Miura Dolphins Co. Ltd.) MANDATORY CREDIT
LeBron saves Hea... Miami Heat small forward LeBron James (6) is congratulated by Dwyane Wade (3) after defeated the Indiana Pacers in Game 1 in their NBA basketball Eastern Conference finals playoff series, Wednesday, May 22, 2013 in Miami. The Heat won 103-102 in overtime. (AP Photo/Lynne Sladky)
Polish man gets ... EDS NOTE GRAPHIC CONTENT -In this picture provided by the Cancer Center and Institute of Oncology in Gliwice, Poland, a 33-year-old Polish man whose face was torn off by stone-cutting machinery is shown after undergoing a total face transplant. Doctors performed the surgery on May 15 in a 27-hour operation. In a news conference on Wednesday they said it was the first time a life-saving face transplant was carried out soon after a recipient suffered damage. There have been several other transplants in recent years but in those cases doctors had months or years to prepare. The Polish patient suffered his accident on April 23, 2013.(AP Photo/Cancer Center and Institute of Oncology in Gliwice)
Woods: Garcia co... In this photo made May 12, 2013, Sergio Garcia, of Spain, left, shakes hands with Tiger Woods at the end of the third round of The Players championship golf tournament at TPC Sawgrass in Ponte Vedra Beach, Fla. Garcia apologized to Woods on Wednesday, May 22, 3013, for saying he would have "fried chicken" at dinner with his rival, a comment that Woods described as hurtful and inappropriate. (AP Photo/Gerald Herbert)
Minn. teen whose... Zach Sobiech, left, walks with his girlfriend, Amy Adamle, between classes at Stillwater High School in Stillwater, Minn., on Dec. 3, 2012. "She's strong enough to share the load with me, said Sobiech. Sobiech, the Lakeland, Minn. teenager whose song "Clouds" became an Internet sensation, died early Monday, May 20, 2013 at his home, surrounded by family and his girlfriend, according to a CaringBridge post by Zach's mother. He was 18. Sobiech, who had a rare form of bone cancer, began writing songs of farewell to family and friends last fall. His first song, "Clouds," went viral and has received almost 3 million hits on YouTube. (AP Photo/St. Paul Pioneer Press, Ben Garvin)
4 Americans kill... FILE - In this May 21, 2013 file photo, President Barack Obama speaks in the State Dining Room of the White House in Washington. The U.S. will refocus its attention on homegrown terror threats against Americans, President Barack Obama will say in a Thursday speech that is forecast as skimpy on any new sweeping policies. The move reflects the global fragmentation of al-Qaida’s top leaders as the U.S. tries to safeguard against attacks like last month’s deadly Boston Marathon bombings. (AP Photo/Pablo Martinez Monsivais, File)
Penguins rout Se... Pittsburgh Penguins' Jarome Iginla (12) is congratulated by teammates Evgeni Malkin (71) and James Neal after scoring against the Ottawa Senators during second-period NHL hockey playoff game action in Ottawa, Ontario, Wednesday, May 22, 2013. (AP Photo/The Canadian Press, Adrian Wyld)
Obama honors Car... President Barack Obama presents the Library of Congress Gershwin Prize for Popular Song during an East Room concert honoring singer-songwriter Carole King, Wednesday, May 22, 2013, at the White House in Washington. King is the first woman to receive the award. (AP Photo/Jacquelyn Martin)
Brutal attack in... Police cordon off the scene of an attack which has left one man confirmed dead and two people wounded near Woolwich barracks in London Wednesday, May, 22, 2013. Scotland Yard said officers responded to reports of an assault Wednesday afternoon in the London neighbourhood of Woolwich. London Ambulance service said one man was found dead at the scene and two other men were taken to the hospital, with one in serious condition.(AP Photo/Alastair Grant)
3rd grader who l... FILE - A Tuesday, May 21, 2013 file photo, an aerial view shows Plaza Towers Elementary School, which was destroyed in Monday's tornado, in Moore, Okla. Unlike several others schools in the Oklahoma City area, Plaza Towers had no “safe room” in which students and teachers could huddle. The deaths of seven students at Plaza Towers highlights the patchwork of protection that exists at schools in tornado-prone parts of the central U.S. (AP Photo/Tony Gutierrez, File)
Who else took th... FILE - In this Dec. 18, 1986 file photo, Oliver North is sworn in on Capitol Hill in Washington prior to testifying before the House Foreign Affairs Committee. Lois Lerner of the IRS joins a diverse roll call of people who have invoked their Fifth Amendment right not to answer lawmakers’ questions over the years. North cited his Fifth Amendment rights and refused to answer committee question availing the Iran arms sale. (AP Photo/J. Scott Applewhite, File)
10 Things to Kno... Residents sift through debris of a destroyed home in Moore, Okla. on Wednesday, May 22, 2013. A massive tornado roared through the Oklahoma City suburb on Monday, flattening everything in its path. (AP Photo/The Dallas Morning News, Brad Loper) MANDATORY CREDIT; MAGS OUT; TV OUT; INTERNET USE BY AP MEMBERS ONLY; NO SALES
Man shot to deat... This May 4, 2013 police photo provided by the Orange County Corrections Department in Orlando, Fla., shows Ibragim Todashev after his arrest for aggravated battery in Orlando. Todashev, who was being questioned in Orlando by authorities in the Boston bombing probe, was fatally shot Wednesday, May 22, 2013 when he initiated a violent confrontation, FBI officials said. (AP Photo/Orange County Corrections Department)
Weiner launches ... FILE - In this June 16, 2011 file photo, Anthony Weiner speaks at a news conference in New York. The Democratic ex-congressman who resigned over raunchy tweets said late Tuesday, May 21, 2013, that he's in the New York City mayoral race. Although the field is crowded for September's primary, Weiner is arriving with some significant advantages, including a $4.8 million campaign war chest, polls showing him ahead of all but one other Democrat, and no end of name recognition. (AP Photo/Seth Wenig, File)
Jury in Arias tr... Jodi Arias stands as the jury enters the courtroom on Wednesday, May 22, 2013 during the penalty phase of her murder trial at Maricopa County Superior Court in Phoenix. Jodi Arias was convicted of first-degree murder in the stabbing and shooting to death of Travis Alexander. (AP Photo/The Arizona Republic, Rob Schumacher, Pool)
Broke no laws, I... IRS official Lois Lerner is sworn in on Capitol Hill in Washington, Wednesday, May 22, 2013, before the House Oversight Committee hearing to investigate the extra scrutiny IRS gave to Tea Party and other conservative groups that applied for tax-exempt status. Lerner told the committee she did nothing wrong and then invoked her constitutional right to not answer lawmakers' questions. (AP Photo/Carolyn Kaster)
Union power at i... Los Angeles Mayoral candidate Eric Garcetti arrives for an election night rally Tuesday, May 21, 2013 in the Hollywood area Los Angels. Garcetti defeated Controller Wendy Greuel to become next mayor of Los Angeles after a campaign in which he depicted his rival a pawn of powerful labor bosses. (AP Photo/Chris Carlson)
Median CEO pay r... FILE -In this Tuesday, Sept. 12, 2006, file photo, Leslie Moonves, left, president and chief executive officer of CBS, talks with PBS host Charlie Rosein Beverly Hills, Calif. CEO pay has been going up, The highest paid CEO in 2012 was Leslie Moonves of CBS, who made $60.3 million. (AP Photo/Reed Saxon, File)
Doctors save Ohi... Kaiba Gionfriddo plays with the family's dog, Bandit, outside his Youngstown, Ohio home Tuesday, May 21, 2013. Born with a birth defect that caused the boy to stop breathing every day, he can now breathe normally, with a first-of-a-kind biodegradable airway made by Michigan doctors using plastic particles and a 3-D laser printer. (AP Photo/Mark Stahl)
Kerry: US, allie... U.S. Secretary of State John Kerry, left, speaks during a joint news conference with his Jordanian counterpart, Nasser Judeh, right, in Amman Wednesday, May 22, 2013. Secretary of State John Kerry says the United States and its Arab and European allies will step up their support for Syria’s opposition to help them “fight for the freedom of their country” if President Bashar Assad’s regime doesn’t engage in peace talks in good faith. (AP Photo/Mohammad Hannon)
4 Americans kill... FILE - In this May 15, 2013, file photo, Attorney General Eric Holder gestures while testifying on Capitol Hill in Washington. Four American citizens have been killed in drone strikes since 2009, Attorney General Eric Holder said Wednesday, May 22, 2013. Holder said that in conducting U.S. counterterrorism operations against al-Qaida and its associated forces, the government has targeted and killed one American citizen, Anwar al-Awlaki. Al-Awlaki, a radical Muslim cleric, was killed in a drone strike in September 2011 in Yemen. The administration released the information the day before President Barack Obama is scheduled to make a major speech on national security. (AP Photo/Carolyn Kaster, File)
Government suppo... Spain's Prime Minister Mariano Rajoy attends a meeting with small companies in central Madrid
Hamas rebuffs Ar... Palestinians hold a placard depicting senior Hamas leader Haniyeh during a rally in Nablus
Job market resil... People wait in line to meet a job recruiter at the UJA-Federation Connect to Care job fair in New York
Obama tells Mexi... U.S. President Obama delivers a speech during his visit to Mexico City
Hungary court al... Marton Gyongyosi, a leader of Hungary's third-strongest political party Jobbik, attends an interview with Reuters in Budapest
Column: The glob... U.S President Obama speaks beside Mexico's President Enrique Pena Nieto (not pictured) during a news conference after attending
Muslims in Myanm... Muslim men from Win Kite village look from behind the fence which residents built to protect their village from mob attacks
Taking sides in ... Massarwa attends a remand hearing at court near Tel Aviv
Dozens dead as A... Smoke rises after what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Homs
EU sees deeper e... People walk past the shop window of a jewelry store in central Barcelona
Prosecutor in Bh... Security officials inspect the damaged car, which prosecutor Chaudhry Zulfikar was travelling in, when he came under attack by u
Obama blesses Me... U.S. President Obama alights from Air Force One as he begins his visit to Mexico City
Engineer who war... File picture shows people rescuing garment workers trapped under rubble at the Rana Plaza building after it collapsed, in Savar
Analysis: TPG-Ax... An electronic display identifies the post that trades SandRidge Energy stock on the floor of the New York Stock Exchange
Exclusive: At Te... File picture shows the burning remains of a fertilizer plant after an explosion at the plant in the town of West, near Waco, Tex
North Korea coul... A North Korean nuclear plant is seen before demolishing a cooling tower in Yongbyon
Analysis: Doubli... U.S. President Barack Obama nominates Pritzker and Froman at White House in Washington
U.S. seeks North... An undated still image of a video footage shows a portrait of U.S. citizen Kenneth Bae
States balk at m... President Obama's fiscal 2014 budget proposal is released and distributed to Senate staff members on Capitol Hill in Washington
FBI releases pho... The U.S. Consulate in Benghazi is seen in flames during a protest
Gaddafi's son Sa... Still image taken from video of Saif al-Islam, son of deposed Libyan leader Muammar Gaddafi, sitting behind bars in Zintan
U.S. rethinking ... U.S. Defense Secretary Hagel and British Defense Secretary Hammond hold a joint news conference at the Pentagon in Washington
Obama rounds out... U.S. President Barack Obama announces new nominees at the White House in Washington
Analysis: Canadi... Cranes stand at various condominium developments in Toronto
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