1 dead, 3 injured after 'intentional' explosion at California medical building

Emergency services attending the explosion in Aliso Viejo

Emergency services attending the explosion in Aliso Viejo

Aliso Viejo is about 50 miles southeast of Los Angeles.

The explosion occurred at about 1 p.m. and caused damage to the first floor of the two-story building, which was under construction.

A federal official told The Associated Press late Tuesday that the explosion is believed to have been intentional and may have come from a package.

Authorities had not found an explosive device Tuesday night but were searching through debris that was left after the blast. Orange County Fire Authority Chief Brian Fennessy said no children were injured and all are accounted for.

The FBI is responding to the scene, a law enforcement official told CBS News senior investigative producer Pat Milton.

"The corner of that building, the whole bottom floor is pretty much blown out", fire Capt.

"We have not determined what caused the blast", said Carrie Braun, a Public Information Officer at Orange County Sheriff's Department. She and the three injured were likely in close proximity to the explosion, Sawyer said.

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Children and staff at nearby Academy on the Hills preschool initially sheltered in place while the investigation continued, but children were later evacuated to a Target store parking lot so they could be reunited with their parents.

McWilliams says she saw two women covered in ash and soot stagger out of the building. The person who died was inside the building at the time of the blast, officials said.

"Take care of my mother, take care of my mother!" shouted one woman as she fled, according to NBC4.

He explained that authorities were being extra cautious because they "don't see explosions in commercial buildings" often.

Shin said he also saw "fire, smoke, insulation popping out of the walls, a lot of scared people running around, a lot of commotion". The other woman was burned and her head was bleeding.

Of the three people who were injured, Ms. Braun said, two suffered "significant" injuries while the third complained of smoke inhalation.

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