Continued from page 1

“There were things that they would be more forthcoming on and things that they would just not respond to,” Rubincam said of Russian intelligence officials.

Tsarnaev was one of many leads the FBI was pursing based on Russian intelligence, he said. When the Russians asked the FBI in March 2011 to look into Tsarnaev, the FBI did. The bureau also asked the Russians whether they had any more information on Tsarnaev that they could share with the U.S., but Russia was unresponsive.

___

Associated Press writers Bradley Klapper, Eric Tucker and Darlene Superville contributed to this report.