More than a dozen military weapons are missing after an overnight break-in at a Massachusetts army reserve center, officials said. The Worcester armory's missing weapons include six M4 assault rifles, 10 pistols, and several long guns, a law enforcement source told the Daily Beast. FBI agents were looking into the gun heist, said Hank Shaw, a special agent in charge of the FBI's Boston division. Shaw said the break-in is not being considered as a terrorist threat.