Lambton OPP are investigating after a robbery at the Royal Bank branch in Corunna on Monday afternoon.

Officers were called to the Lyndoch Street branch around 1:45 p.m. for a report of a robbery.

The male suspect was last seen running through the parking lot toward Murray Street.

He is described as 5'9" tall, wearing a black jacket with a logo on the front left side, light blue jeans and white runners.

OPP say he is believed to be in possession of a firearm.

The West Region Canine Unit, Emergency Response Team and Tactics and Rescue Unit were all called in to assist, but a search of the area was unsuccessful.

The West Region OPP Forensic Identification Services Unit has also been called in to assist with the investigation.

No injuries were reported in the incident.

Anyone with information is asked to contact the OPP at 1-888-310-1122 or Crime Stoppers at 1-800-222-8477.