FBI: Cell Phones Triggered Bombs

A few years back I remember reports going out warning people about a new "mobile phone gun", which was a gun disguised as a mobile phone. The story said that people were trying to sneak them on airplanes (this was well before September 11th). Well, now apparently, you have to watch out for mobile phone bombs as well. The evidence from one of the recent bombings in Saudi Arabia suggests that it may have been set off by a mobile phone bomb. The FBI report doesn't say specifically that it was set off by such a bomb, but that they found mobile phone bombs on the scene. The bomb is apparently built into the phone, and is detonated when the phone receives a phone call.