One person was killed and three others were injured on Tuesday in an explosion at an office building in the USA state of California, authorities said, Xinhua reported.
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.
In a late-afternoon briefing, Orange County officials said no cause had been either determined or ruled out, whether a gas leak or an intentional act.
Bomb squad investigators and FBI agents were looking into the cause of the blast Tuesday.
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Federal Bureau of Investigation spokesman Mike Gifford had said earlier there was no initial indication of terrorism in the facility about 7 miles northeast of Laguna Beach.
The explosion, in a normally tranquil South Orange County city, prompted the evacuation of nearby businesses and a school filled with children, officials said.
In a news conference Tuesday night, Orange County Sheriff's Department Commander Dave Sawyer said it was unclear whether the explosion was intentional or accidental.
Dong Shin said he had seen "fire, smoke, insulation popping out of the walls, a lot of scared people running around, a lot of commotion".
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Federal, state and local authorities, including the FBI and the Department of Homeland Security, are investigating the blast, which occurred on the first floor of a building that was under renovation. They expected a lengthy investigation to determine the cause. McWilliams says one woman had skin peeling on her arm. Other people could be scene wheeling cribs down the street as the area was evacuated. The other woman was burned and her head was bleeding.
Authorities said they are not actively seeking a suspect. Initially it was reported that the vehicle crashed into the building, but later it became known that the explosion occurred inside the centre.
Authorities say one person is dead and two others have injuries after an explosion rocked a Southern California office building.
The initial call came in about an hour ago, at which point 10 engines and 70 firefighters were dispatched.
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