What was thought to be an altercation between a man and woman last week in Moorhead turned out to be a robbery over drugs.

A shotgun was fired into the wall of an apartment at 824 2nd Avenue South early last Tuesday.

Investigators determined 23-year-old Chantel McGuire of Tower City and 22-year-old Christopher Martell of Fargo were involved.

McGuire was arrested on Thursday in Moorhead for assault, robbery and aiding and abetting.

Martell was taken into custody in Glendive, Montana on Saturday and faces similar charges.

The gun was also recovered.