'Did So,' Says FBI About Sharing Tsarnaev Warnings With Boston PD

Massachusetts officials claim otherwise

A skirmish between the FBI and the Boston police erupted into public view after the bureau sought to rebut a claim that police weren't aware of a federal probe of the alleged mastermind of the Boston Marathon bombing.

At a congressional hearing yesterday in Washington, Boston Police Commissioner Edward Davis said police who served on Boston's Joint Terrorism Task Force, or JTTF, weren't made aware of the 2011 FBI investigation of Tamerlan Tsarnaev, or of the suspect's six-month trip to Russia last year.

In response, the FBI issued a statement yesterday saying police members of the JTTF had complete access to all information compiled by the agency related to potential terrorist suspects through Guardian, software that manages the database.