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Boston Bombing: Authorities pursuing persons of interest
Congressman Mike Rogers, the Republican chairman of the House intelligence committee, said better cooperation from Russia was needed in Washington's probe of the two suspected bombers' recent contacts and activities.
Speaking on ABC's "This Week," Rogers said he believed that Tamerlan Tsarnaev, 26, the elder of two ethnic Chechen brothers suspected of carrying out the April 15 blasts in Boston, clearly changed during his visit to Russia in 2012, becoming "radicalized."
"I think they (Russia) have information that would be incredibly helpful and that they haven't provided yet," he said.
New details of the unfolding investigation emerged following reports on Saturday that Tamerlan Tsarnaev spoke to his mother about "jihad" in a 2011 phone call secretly recorded by Russian officials.
U.S. authorities learned of the wiretapped discussion between Tsarnaev and his mother, Zubeidat Tsarnaeva, within the last few days, CBS News reported. Tsarnaev died in an April 18 shootout with police, three days after the bombings that killed three people and injured more than 260 others.
Asked about the information Russia might have, Rogers said of Russia's spy service, "The FSB is a hostile service to the FBI and the CIA and there is cultural problems there between where the Russians are and our folks. So they sent a letter, didn't have a lot of information."
Rogers added that subsequent U.S. requests for assistance have not been met.
"We still have persons of interest that we're working to find and identify and have conversations with," said Rogers. The Michigan lawmaker declined to say how many "persons of interest" there were.
"We are looking at phone calls before and after the bombing," the intelligence committee's senior Democrat, C.A. Dutch Ruppersberger of Maryland, also said on ABC.
The revelations that others are being sought for questioning came as the suspected bombers' father told Reuters on Sunday that he has abandoned plans to travel to the United States. Speaking from a village in southern Russia, Anzor Tsarnaev said he believed he would not be able to see his surviving son, Dzhokhar, 19, who is being held in a federal prison in Massachusetts on charges he also carried out the bombing.