By Joe Johns, Barbara Starr, Gloria Borger and Carol Cratty
Months after the FBI cleared Tamerlan Tsarnaev in its investigation of possible connections to jihadist causes, the Russians approached the CIA as well to look into him, CNN has learned.
But what was provided by the Russians in late September 2011 was "basically the same" information that had been given the previous March to the FBI, according to a government official.
The source said the communication was a "warning letter" sent to the CIA.
Tsarnaev, 26, suspected along with his younger brother of bombing the Boston Marathon early last week, died on Friday following a violent confrontation with police.
By Paul Cruickshank and Tim Lister
He was born and raised in the United States, and killed by the United States. And now from beyond the grave he inspires a new generation of would-be terrorists to attack the United States.
Militant cleric Anwar al-Awlaki continues to speak through sermons posted online, and U.S. officials are investigating whether his words may have influenced Boston bombers Tamerlan and Dzhokhar Tsarnaev.
A U.S. government official told CNN's Jake Tapper on Tuesday that "the preachings of Anwar al-Awlaki were likely to have been among the videos they watched." A U.S. government source had previously told CNN that Dzhokhar Tsarnaev had claimed the brothers had no connection to overseas Islamist terrorist groups and were radicalized through the Internet.
Al-Awlaki lived in Colorado, California and Virginia before leaving the United States in 2002. At one point he met two of the men who would be among the 9/11 hijackers, an encounter later investigated by the FBI. There is no evidence that al-Awlaki knew of their plans.
By Pam Benson
The name of one Boston Marathon bombing suspect was included in U.S. law enforcement and counterterrorism databases, but he was not on any watch list that would have prevented him from flying or required additional screening when he left or entered the country, according to intelligence and law enforcement officials.
After the FBI was asked by the Russians in early 2011 to investigate Tamerlan Tsarnaev's possible connection to jihadist causes, his name was put on a Customs and Border Prevention list known as TECS, used to detect unusual or suspicious travel, so that the FBI and other agencies would know if he traveled outside the United States.
The FBI investigation turned up no terrorism threat or any other derogatory information and the case was closed in June of 2011.
Several months later in the fall of 2011, the CIA received from the Russians information almost identical to what had been given to the FBI, according to a U.S. intelligence official.
By Elise Labott reporting from Brussels
Secretary of State John Kerry brought together Afghan and Pakistani leaders on Wednesday to help soothe tensions between the two countries and try to breathe life into the reconciliation process with the Taliban.
Keeping expectations low for any immediate progress in the process, Kerry said all sides still have "homework" to do.
"We have agreed that results will tell the story, not statements at press conferences," Kerry told reporters in Brussels before returning to Washington. "We are not going to raise expectations or make any kind of promises that can't be delivered."
Kerry hosted Afghan President Hamid Karzai and Pakistani Army chief Gen. Ashfaq Kayani at Truman Hall, the secluded estate of the U.S. Ambassador to NATO outside Brussels.