Gordon Edwards, of the Department of Infrastructure, said the mobile camera surveillance van was a controlled unit and would be situated in areas where drivers were most likely to use their phones.

BBC: IOM govt

An FBI affidavit released Monday reveals incriminating evidence against Tsarnaev, including surveillance-camera footage that shows him raising his mobile phone to his ear just before the two blasts.

NPR: Uphill Battle For Defense Of Marathon Bomb Suspect