A three-alarm fire erupted Wednesday morning at a residential construction site in the Upland area, engulfing multiple structures and prompting a massive response from firefighters.
The blaze was reported about 5:20 a.m. in the 100 block of North 13th Street, near the Upland-Ontario border, according to the San Bernardino County Fire Department. There were no immediate reports of injuries.
News video from AIR7 HD showed firefighters attacking the flames on the ground, on rooftops and from atop an engine ladder.
The cause of the fire is unknown.