What we know about mysterious, deadly explosion at California medical building

What we know about mysterious, deadly explosion at California medical building

One woman was killed and three others were injured in the blast, which occurred about 1:10 the first floor of the two-story building at 11 Mareblu, according to the Orange County Fire Authority.

The official said the information was based on a preliminary investigation. Some witnesses said they initially thought it was an quake but soon realized it was some type of explosion as smoke filled the area.

The official, who was briefed on the investigation, was not authorized to discuss the matter publicly and spoke to The Associated Press on condition of anonymity.

Federal Bureau of Investigation official Paul Delacourt says investigators do not believe the Tuesday afternoon blast in the city of Aliso Viejo was an accident, and items that were possibly part of an explosive device have been sent to an Federal Bureau of Investigation lab.

Associated Press writer Michael Balsamo in Los Angeles contributed to this report.

An explosion rocked a Southern California medical office building Tuesday, killing a woman and injuring three other people, authorities said.

The blast, which blew out almost the entire first floor, sent plumes of white smoke into the air and debris flying into the parking lot. He also saw "fire, smoke, insulation popping out of the walls, a lot of scared people running around, a lot of commotion", he said. Police investigators and FBI agents are studying the causes of the explosion, and they assure that there is no lingering threat to the community.

Orange County Undersheriff Don Barnes speaks to the media on Wednesday, May 16, 2018 regarding an explosion at a Aliso Viejo medical building the previous day. Dave Sawyer told reporters on Tuesday that investigators "don't know if it was an intentional detonation of a device". The three people who were injured were nearby and were being questioned by investigators late Tuesday night, he said.

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

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One woman, who had burned skin peeling from her arm, said, "Take care of my mother", McWilliams said.

". They weren't on fire, they were helping each other across the street, walking very slowly and a lot of shock, shaking, just full of ash all over their face, eyes bloodshot, just blood all over", the woman said.

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.

"We have not confirmed that the explosion is intentional, nor have we conclusively identified the source of the explosion".

The identity of the female victim killed has not been released.

One of the officials said one of them was believed to be the target.

The cause of the blast remained a mystery for much of the day, with officials initially believing a vehicle had smashed into the building.

Although the cause of the blast was still unknown, Bommarito told reporters Tuesday afternoon that there was "no immediate hazard" to the community.