OCFA firefighting crews responded to a two-story commercial building fire at 7441 Chapman Ave. in Garden Grove at 11:20 a.m. today. The fire was upgraded to 3-alarms.

Firefighters initially went inside to search for people and confine the three alarm blaze. Due to the extreme fire conditions, the fire crews were pulled out and they went into a defensive mode.

Defensive mode means that the firefighters maintained position outside the building while dousing it with water.

No injuries were reported and no cause was determined this morning. The incident remains under investigation.

The location is apparently home to a Spectrum office building.