Grand Forks police are investigating an armed robbery at a Menards store.

Grand Forks police are investigating an armed robbery at a Menards store.

Authorities say a male tried to leave the store about 8 p.m. Sunday with a cart full of unpaid merchandise and pulled a knife when confronted by store employees. No workers were hurt.

The suspect fled in a sport utility vehicle driven by another man.

Police tracked down the vehicle and arrested the 55-year-old driver, but they're still looking for the first suspect.