LOS ANGELES — An explosion that rocked a Southern California medicaloffice building on Tuesday, killing a woman and injuring three otherpeople, is being investigated as intentional and investigators believe theblast may have come from a package, a U.S. official told The AssociatedPress.
The explosion at the office building in Aliso Viejo — about 50 miles (80.5kilometers) south of Los Angeles — blew siding off the walls, exposinginsulation and framing.
Authorities had not found an explosive device Tuesday night but weresearching through debris that was left after the blast. The official saidthe information was based on a preliminary investigation.
The official, who was briefed on the investigation, was not authorized todiscuss the matter publicly and spoke to The Associated Press on conditionof anonymity.
Orange County sheriff’s Cmdr. Dave Sawyer said the size of the explosionmade is suspicious.
“We have not found any type of specific device inside of the building rightnow that would tell us or lead us to exactly what the device was — ifthere was a device,” Sawyer said.
Bomb technicians from the Orange County Sheriff’s Department, the FBI andother agencies were investigating, said Paul Delacourt, the assistantdirector in charge of the FBI’s field office in Los Angeles. He referred tothe explosion site as a “crime scene