GRANITE CITY, Ill. (AP) — A mortar round exploded Monday at a suburban St. Louis metal recycling plant that does business with the military, killing two people.

The explosion at Totall Metal Recycling in Granite City occurred about 6:25 a.m., police said. Totall Metal Recycling, which employs about 160 people, according to its website, does business with the military and it’s not unusual for it to have items such as “military engines and ammunition casings,” police chief Rich Miller said.