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Congressional intelligence leaders said on Sunday that authorities are pursuing “persons of interest” in the United States in connection with the Boston Marathon bombings, and asked for more help from Russian spy agencies.

Congressman Mike Rogers, the Republican chairman of the House Of Representatives 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.