HOUSTON -

Arson units investigated a building fire that occurred Friday night in north Houston.

Around 11:30, the Cypress Fire Department responded to a heavy fire blazing in an office building on Cypress North Houston and Marcia.

Firefighters said they made a fast attack and put out the flames.  The building was closed for the night and no one was injured.

However, fire officials said there might have been a break-in before the fire started. 

The cause of the fire was not immediately known.