Federal authorities were hunting Friday for more than 100 rifles stolen from a boxcar parked in an Atlanta train yard, according to a report from The Associated Press.

The weapons were taken from a CSX rail yard on the city’s northwest side in mid-November, says Richard Coes, a spokesman for the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives. The weapons included assault rifles that Coes describes as “AK-style,” AP reports.

Gary Sease, a spokesman for rail line CSX Corp., says the Jacksonville, Fla.-based company is cooperating with law enforcement to recover the weapons and investigate the theft. Authorities say that the rifles were stolen on or around November 12, according to the AP report.