The cause of a restaurant fire early this morning in east Ottawa is under investigation.

It took 38 firefighters less than half an hour to quell a blaze at the Boston Pizza location on St. Laurent Blvd. near Cyrville.

The 911 call came in just before 7 a.m.

Fire officials say the blaze started in the roof.

Damage to the restaurant is extensive.

There were no injuries reported.