More than 100 Los Angeles County firefighters responded to a large commercial building fire in El Monte Saturday morning.

The fire broke out just before 10:40 a.m. at a building located at 4601 Arden Drive.

Multiple engine companies responded to the scene as flames were visible and smoke billowed from the single-story commercial building.

By 11:45 a.m., the fire had grown to a third-alarm fire and firefighters began to switch to “defensive mode,” County Fire said in a tweet.

Multiple 100-foot firefighting ladders surrounded the vacant building, putting water on the structure from above as firefighters continued to battle the flames.

As of 2 p.m. Saturday, no injuries were reported.

Check back for updates on this developing story.