GRANDVILLE, MI -- A fire on the roof of the Red Lobster restaurant in Grandville was caused by a roofing contractor smoking a cigarette while handling combustible materials, fire officials said.

Grandville Fire Chief Mike May released the cause on Saturday, May 21.

The restaurant fire, at 3464 Rivertown Pointe Court, left a firefighter hospitalized for possible heat exhaustion and caused minor injuries to two roofing workers who tried to extinguish the flames.

The fire was reported at 2:33 p.m. Friday, May 20.

Related: Red Lobster fire contained to roof; firefighter hospitalized for heat exhaustion

Firefighters arrived to find fire showing on the roof and in an adjacent parapet wall. Firefighters quickly contained the flames and damage was contained to the roof decking and parapet wall.

None of the restaurant interior was damaged.

The firefighter taken to the hospital stayed overnight and was in good condition Saturday, May said.

A fire lieutenant on Friday said the roofing contractors were using rags to clean a back corner of the roof when the fire started.

E-mail John Tunison: jtunison@mlive.com and follow him on Twitter at twitter.com/johntunison