>> they were going to make this dramatic announcement and ask for help. find these guys. >> we are releasing photos of these two suspects. the photos and videos are posted for the public and media to use, review and publicize. >> this rules out the lone wolf crazy person scenario, if two people are together, practicing, potentially buying these products together or selling together, they're also planning their escape. >> we worked all through that night up until the 10:00 news and just about 11:00, our phones are going off, crazy. crazy. >> oh, my goodness. all units respond. officer down. officer down. >> get on it! >> over at cambridge, a cop was shot. >> police are investigating a fatal shooting of m.i.t. campus police officer by two men who then committed an armed car jacking in cambridge. >> we hear the scanner and it is