Published: Mar 20, 2012 1:01 PM EDT
Updated: Mar 20, 2012 5:56 PM EDT

FORT MYERS, Fla.- The state fire marshal's office is investigating a suspicious fire in Fort Myers. It started on the roof of the Family Food Mart on MLK Boulevard just before 5:00 am Tuesday morning.

Firefighters responded to a call of smoke and flames from the roof of the building. They broke through the front door and found the store filled with smoke.  Firefighters were able to determine the fire was not burning inside.  Once they determined the fire was burning on the roof of the building, they got it under control very quickly.

Early indications are that the fire started at or near the Air conditioning unit on the roof.  Firefighters say they are calling it suspicious, but won't comment further as to why.

The battalion chief on scene says the building is not a total loss, but does have significant smoke damage inside.