TMZ.com passed this along:

WWE Stage Catches Fire at ‘Monday Night Raw’ Rehearsal

DO YOU SMELLLLLLL …. something burning?

TMZ has learned … the Cincinnati Fire Department raced to the US Bank Arena moments ago after a fire broke out on the stage at WWE rehearsals for tonight’s “Monday Night Raw.”

A rep for the WWE tells us the fire began due to a “minor incident involving the show’s pyrotechnics” … and as a precaution, the “limited number of people in the building during the incident were successfully evacuated.”

The rep tells us no one was injured in the blaze … and there was no major damage to the arena. We’re told the fire marshal has since inspected the damage and gave the all-clear for WWE to proceed with tonight’s event.