Federal investigators say they intercepted the messages between the suspect, Maj. Nidal Malik Hasan, and Anwar al-Awlaki, a radical American-born cleric. They were passed along to two Joint Terrorism Task Force cells led by the FBI, but a senior defense official said no one at the Defense Department knew about the messages until after the shootings. The official spoke on condition of anonymity in order to discuss intelligence procedures.
Sen. Carl Levin, D-Mich., said Friday after a briefing from Pentagon and Army officials that his committee will investigate how those and other e-mails involving Hasan were handled and why the U.S. military was not made aware of them before the Nov. 5 shooting.
Levin said his committee is focused on determining whether the Defense Department's representative on the terrorism task force acted appropriately and effectively.
Levin also said he considers Hasan's shooting spree, which killed 13 and wounded more than 30, an act of terrorism.
"There are some who are reluctant to call it terrorism but there is significant evidence that it is. I'm not at all uneasy saying it sure looks like that," he said.
He said his committee will also look into whether military members have the ability to report suspicious behavior evinced by colleagues.
The Washington Post, citing two anonymous sources, reported Saturday that in the months leading up to the attacks Hasan stepped up his contacts with al-Awlaki to discuss transferring money. One of the sources told the Post the two men considered how to transfer funds abroad without coming to the attention of law enforcers.
FBI and military officials have provided differing versions of why Hasan's critical e-mails to al-Awlaki and others did not reach Army investigators before the shooting.
FBI officials have said a military investigator on the task force saw the e-mails and looked up Hasan's record, but finding nothing particularly worrisome, the investigator neither sought nor got permission to pass the e-mails on to other military officials.
But the senior defense official has countered that the rules of the task force prevented that military representative from passing the records on without approval from other members of the task force.