An FBI spokeswoman said some weapons have gone missing following a break-in at an Army Reserve center in central Massachusetts.
Kristen Setera said the Boston FBI became aware of the break-in at the Lincoln Army Reserve Center in Worcester on Sunday. She said terrorism is not suspected.
Authorities hadn't yet determined when the break-in occurred or exactly how many weapons were stolen.
Setera said, "Every effort will be made to recover these weapons immediately."
Descriptions of the missing weapons have been entered into the National Crime Information Center, an online database searchable by law enforcement.
The break-in was first made public during a press conference with Massachusetts Governor Charlie Baker. State Police referred questions to the FBI.