Greg Toppo

USATODAY

Police in Anaheim, Calif., were investigating an explosion early Sunday afternoon after reports of a pipe bomb detonation, local media reported.

No injuries were immediately reported.

Bomb squad personnel were investigating the explosion, The Orange County Registerreported. Police, meanwhile, temporarily evacuated homes in the area.

Police were called to a block of North Anaheim Boulevard around 1:50 p.m. PT, after a report of an explosion, Sgt. Daron Wyatt told the newspaper. He said police received reports that the explosion was a pipe bomb, but he couldn't immediately confirm the source.

Wyatt said the explosion took place in an alley, doing moderate damage to the outside of a nearby building.

Anna Trujillo, who works at a car dealership nearby, said she was assisting customers when they heard the explosion in the alleyway. She told CBS News she initially thought there had been a shooting.

“It was too loud to be a shot so we were like, ‘It has to be a bomb.’ And then we see all the white smoke coming out,” Trujillo said. “I was scared.”

The area is about three miles north of the Disneyland theme park.