The fire was dispatched at 4:08 p.m. to the Red Robin Gourmet Burgers restaurant at 8657 West 135th Street.
Firefighters found "a fire in the ceiling" of the business with all occupants outside the building when crews arrived about 4 minutes later.
Photos taken from an OP traffic camera nearby shows 1) white smoke coming from the roof of the business and 2) a OPPD ladder tower extended to Red Robin's roof.
The fire was reported under control at 4:35 p.m.- but then flames broke out in the grill's roof vent- as shown in photos 3 & 4.
Red Robin Burgers at this location will be closed while OP health inspectors look over the damage which sounds to be considerable.