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Authorities say explosives experts are trying to determine what caused an explosion that killed a woman and injured three other people at a Southern California medical office building.

The explosion Tuesday blew out walls and windows of the facility, heavily damaging the first floor corner of the two-story building in Aliso Viejo, about 50 miles southeast of Los Angeles, according to Orange County Fire Authority.

"At this point, our working theory is that this explosion was caused by a device, and although the damage was extensive there are some components that we have located at the scene of the explosion that are inconsistent with what one might expect to find at this business", said Paul Delacourt, the assistant Federal Bureau of Investigation director in charge at the Los Angeles field office. 'Our working theory is that this explosion was caused by a device'.

The officials said the explosion did not appear to be part of a broader plot and there was no immediate connection to any extremist groups.

A U.S. official told the Associated Press the authorities were investigating it as an intentional act and a package may have caused the blast.

Barnes said authorities believe the victim who was killed in the blast was Ildiko Krajnyak of Trabuco Canyon.

Authorities say they believe a woman killed in an explosion at a Southern California office building ran a day spa there.

Krajnyak's Facebook page showed her enjoying life, taking trips to Seattle - where she took a photo at a University of Washington Husky football game - to Las Vegas, and to Hungary. Barnes said she was likely the owner of the day spa there. Her Facebook page showed photos from her home country, including a selfie outside the clinic where she trained to become an aesthetician 30 years ago.

Mary McWilliams told The Orange County Register that she arrived for an appointment to find smoke in the area and vehicle alarms going off.

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Fennessey says the blast involved a building under renovation. The family asked for privacy as they mourn "a mother, a wife, a daughter and a friend".

Investigators said they hadn't yet located an explosive device and were searching through debris.

Witnesses spoke of a loud crash and said they saw two women who had been burned in the explosion come out of the building.

Fire officials said a third person suffered smoke inhalation. Several businesses along Mareblu remained closed on Wednesday.

They also searched Krajnyak's house in Trabuco Canyon.

From a Sheriff's Department news conference at noon: The victim was IIdiko Kranjnyak, 40, who owned the day spa in the building.

Investigators don't know who set off the explosion or why, but it is being investigated as a criminal act, said Don Barnes, Orange County Undersheriff.

Pieces of the device found at the scene were being sent to the FBI's laboratory in Quantico, Virginia, to be analyzed, he said.