At the medical center of the American city of Aliso Viejo, California, occurred explosion in which result one person was lost.
But the source also cautioned that it's early in the investigation.
An Orange County Sheriff's Department spokeswoman said: "We're trying to determine if a vehicle was involved or if it was an accident or inside the building".
This photo taken from video provided by KABC-TV shows a building after an explosion in Aliso Viejo, California, May 15, 2018.
Mary McWilliams of San Clemente tells the Orange County Register that she saw two women with burns stagger out of the building.
Unconfirmed initial witness reports said that the blast may have been a gas explosion, but Orange County Fire Authority Capt.
According to the Orange County Fire Authority, the explosion occurred on the first floor.
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Officials haven't released information about the person who was killed. Crews on scene of possible explosion in Aliso ViejoOne person was pronounced dead at the scene, and three others were injured, OCFA said. Investigators are interviewing the three injured.
"The survivors' injuries were consistent with an explosion, but not necessarily consistent with a bomb".
"We are going to take every precaution necessary before we enter that building", Bommarito said.
At this point, officials are not ruling anything out. OCFA said a bomb squad was sent in to assess the situation and investigate the cause of the blast.
Sheriff's officials said the size of blast made it suspicious.
Authorities initially indicated a vehicle had crashed into the building, but Bommarito said later that did not appear to be the case.
The sheriff's department is partnering with the FBI, the Department of Homeland Security, and the Bureau of Alcohol, Tobacco, Firearms and Explosives, who will assist the investigation. It went off around 1 p.m.