Alberta law enforcement officials have seized four prohibited firearms, including two homemade MAC-11 submachine guns, and arrested two suspects in Edmonton following an eight-month investigation.

The guns were allegedly manufactured at a “professional grade” machinist shop, located just west of Edmonton, according to a press release by Alberta Law Enforcement Response Teams (ALERT) on Wednesday. The owner of the shop was not aware of the guns, the release said.

ALERT Edmonton’s Guns and Gangs unit, with the help of Edmonton police and RCMP, confiscated a Beretta handgun equipped with a suppressor, a modified Suomi submachine gun with two oversized magazines and two homemade MAC-11 submachine guns with suppressors and oversized magazines.

Investigators are still looking into how many MAC-11 submachine guns were produced. They believe some of the weapons have already made their way to the criminal market.

Two suspects were arrested on Aug. 17 following a search of two Edmonton homes and a rural property in Parkland County, where police believe the guns were manufactured.

Jacob Balan, 37, and Amy Brogden, 29, have been jointly charged with 62 criminal offences including, making, trafficking and possession of automatic firearms. The suspects have been released from custody and are due back in court on Sept. 18.

None of the allegations have been tested in court.