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FBI interviewed Boston bombing suspect in 2011

Tamerlan Tsarnaev (L), 26, is pictured in 2010 in Lowell, Massachusetts, and his brother Dzhokhar Tsarnaev, 19, is pictured in an undated FBI handout photo in this combination photo. The two are suspects in the April 15, 2013 bombing at the Boston Marathon.

Tamerlan Tsarnaev (L), 26, is pictured in 2010 in Lowell, Massachusetts, and his brother Dzhokhar Tsarnaev, 19, is pictured in an undated FBI handout photo in this combination photo. The two are suspects in the April 15, 2013 bombing at the Boston Marathon.

WASHINGTON — The FBI in 2011 interviewed one of the brothers suspected in the deadly Boston Marathon bombings, a U.S. law enforcement source said on Friday, a disclosure that could raise questions about whether the government missed potential warning signs about the men's behavior.

The source said the FBI's dealings two years ago with Tamerlan Tsarnaev occurred following a request from an unidentified foreign government.

The FBI did not produce any "derogatory" information on Tsarnaev and agents then put the matter "to bed," said the source, who spoke on condition of anonymity.

Tamerlan Tsarnaev died overnight in Boston in a shootout with police. His younger brother, Dzhokhar, was taken into custody on Friday evening in the Boston suburb of Watertown after a dramatic, day-long manhunt, Boston police said.

The revelation that the elder Tsarnaev was on U.S. law enforcement authorities' radar screens seemed likely to raise uncomfortable questions for the Obama administration about whether it could have done anything to detect and stop the plot.

"It's new information to me and it's very disturbing that he's on the FBI radar screen," Rep. Michael McCaul, Texas Republican and chairman of the House Homeland Security Committee, said on CNN late Friday.

It is not known when the Boston Marathon bombings were planned, or whether there were clues that could have allowed authorities to pre-empt it.

National security and law enforcement authorities said on earlier Friday that they had not turned up any evidence that the Tsarnaevs had contacts with al Qaeda or other militants overseas. The brothers were in the United States legally.

The officials said they were leaning toward the theory that the bombings were motivated by Islamic extremism, although that remained unproven.

WERE THE TSARNAEVS WORKING WITH OTHERS?

Violent plots involving a single individual or small groups who self-radicalize and have minimal dealings with other militants can be extremely difficult to detect in advance, according to U.S. counterterrorism officials and private experts.

The revelation about the FBI contacts with the elder Tsarnaev came as U.S. officials told Reuters that investigators are scouring government data banks to determine if spy and police agencies missed potential clues that might have alerted them to the two brothers, originally from the Russian republic of Chechnya.

Another top priority for investigators is to determine whether the brothers had any confederates either inside the United States or overseas, one U.S. official said. This official and others spoke on condition of anonymity to discuss an ongoing investigation.

Three people were taken into custody for questioning in New Bedford, Massachusetts, police said on Friday. Two men and a woman are being questioned by the FBI "on the assumption there is an affiliation with" Tsarnaev, Lieutenant Robert Richard of the New Bedford Police said.

One official said the possibility that the U.S. government had information that should have raised questions about the Tsarnaev brothers before the attack could not be ruled out. Other officials said they were unaware that such material had turned up.

In several recent cases, U.S. intelligence and law enforcement agencies failed to put together clues that, in hindsight, might have led them to pre-empt a plot.

In 2009, U.S. Army Maj. Nidal Hassan killed 13 people and wounded another 32 at Fort Hood, Texas. Prior to the shooting spree, Hassan had email contacts with Anwar al-Awlaki, the U.S.-born cleric and leader of al Qaida's affiliate in Yemen who was later killed in a U.S. drone strike.

U.S. authorities had investigated Hassan's emails, but concluded they posed no threat of violence.

The father of Umar Farouk Abdulmutallab, the so-called "underwear bomber" who tried to bring down a U.S. jetliner over Detroit on Christmas Day 2009, reported suspicions about his son's activities to the U.S. Embassy in Nigeria. But Abdulmutallab's U.S. visa was never revoked.

A report by the Senate intelligence committee heavily criticized U.S. intelligence agencies for failing to act on available information in that case.

But Brian Jenkins, a respected terrorism expert at the RAND Corp., dismissed the idea that the Boston bombings represented an intelligence failure.

People will inevitably ask, "did we miss something in intelligence?" said Jenkins, speaking before the news of the 2011 FBI interview with Tamerlan Tsarnaev become public.

"Some people will label it an 'intelligence failure.' But that's because people have come to expect 100 percent security," he said.