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1 killed, 3 injured in explosion in California

1 killed, 3 injured in explosion in California

One person was killed and at least three others were injured in an explosion at a structure in Aliso Viejo, authorities said.

But the source also cautioned that it's early in the investigation.

Bomb technicians from the Orange County Sheriff's Department, the Federal Bureau of Investigation and other agencies were investigating, said Paul Delacourt, the assistant director in charge of the FBI's field office in Los Angeles.

The explosion rocked a medical building in Aliso Viejo, California, on Tuesday.

Mary McWilliams of San Clemente tells the Orange County Register that she saw two women with burns stagger out of the building.

A daycare and preschool are near the site of the explosion, but authorities said all of the children are safe.

He said investigators had not found an explosive device at the scene. Investigators are interviewing the three injured. Two survivors were said to have critical injuries.

At this point, officials are not ruling anything out. The cause of the blast is being investigated.

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"Anytime you see an explosion of this magnitude, it would definitely be suspicious to us and that's why we rolled out all the resources to get to the bottom of it", he said.

The bomb was reportedly addressed to a specific person.

Authorities have said that there is no lingering threat to the public, and there didn't initially appear to be any threats made before the blast or signs of terrorism.

Sheriff's deputies were called to the same block of Mareblu at 11:35 p.m. Monday for a "patrol check", according to sheriff's records.

Dong Shin, a witness, said he heard a loud boom minutes before his appointment in a nearby building.

McWilliams said she saw two burned women staggering out of the building, covered in ash and soot.

The explosion at the office building in Aliso Viejo - about 50 miles (80.5 kilometers) south of Los Angeles - blew siding off the walls, exposing insulation and framing.