One of the guns linked to Islamist militants who carried out the Paris attacks was exported to the United States in 2013, according to the head of a Serbian arms factory.

Milojko Brzakovic of the Zastava arms factory told The Associated Press Thursday that the M92 semi-automatic pistol was traced after its serial number matched the one delivered to an American arms dealer in May 2013.

At least seven of the weapons used or discovered after the Nov. 13 attacks that killed 130 people have been identified as produced by the Serbian factory, most of them manufactured before Yugoslavia broke up in a civil war in the 1990s.

Brzakovic says all those arms were delivered legally, but could have later found their way through illegal channels.