Authorities have arrested a man in connection with a homemade explosive left outside a police station in a small northern Colorado mountain town.

Two law enforcement officials with knowledge of the investigation tell The Associated Press that a suspect was taken into custody over the weekend in connection with the Oct. 11 incident in Nederland. The officials spoke on condition of anonymity because they were not authorized to speak publicly about the case.

A detective found the device in a backpack and brought it into the police station, believing it was lost property. Investigators say it was an active explosive that failed to detonate.

It was not immediately clear what charges the man would face. U.S. attorney spokesman Jeff Dorschner declined to comment.

The case rattled the town of about 1,500, southwest of Boulder.