Of the wounded, two of them had unknown injuries while a third person suffered from smoke-inhalation, Bommarito said.
This picture taken from cellphone video reveals a constructing after a deadly explosion in Aliso Viejo, Calif., Tuesday, Might 15, 2018.
The blast reportedly blew siding of the partitions of a medical workplace constructing, exposing insulation and framing in addition to damaging a primary ground suite.
He said investigators had not found an explosive device at the scene on a lower floor of the building.
A powerful explosion tore through an Aliso Viejo office building that houses a medical office on Tuesday afternoon, killing a woman, injuring three other people and drawing a swarm of law enforcement officers who blanketed the scene amid a throng of curious and concerned onlookers. The cause of the blast is being investigated.
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A USA official says a deadly explosion at a Southern California office building is being investigated as an intentional act and investigators believe the blast may have come from a package. He said that any blast of such magnitude would be investigated as suspicious. All patients were evacuated and rescue service County orange.
"We have not found any type of specific device inside of the building right now that could tell us or lead us to exactly what the device was, if it was a device", he said.
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.
A woman who was on her way to an appointment in the area told CBS2 she arrived just after the blast occurred, and she saw fire on the roof of the building. Tony Bommarito of the Orange County Fire Authority said, according to NBC News.
McWilliams says she saw two women covered in ash and soot stagger out of the building.
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One woman, who had skin peeling on her arm from burns, said, "Take care of my mother", McWilliams said.
Aliso Viejo is south of Los Angeles. The other woman was burned and her head was bleeding. The children were reunited with their parents at a nearby Target parking lot.
"When I was playing outside I heard the big crash, I thought it was a garbage truck but it was a building that smashed", his son, 6-year-old Kingston, said, according to the station.
A daycare and preschool are near the site of the explosion, but authorities said all of the children are safe.
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