The Latest: California blast investigation leads to arrest

This image taken from cellphone video shows a building after a fatal explosion in Aliso Viejo, Calif., Tuesday, May 15, 2018. The cause of the blast i

Firefighters and sheriff's deputies escort children from Academy on the Hill pre-k school in Aliso Viejo, Calif., on Tuesday, May 15, 2018, after a fa

In this photo taken from video provided by KABC-TV, children are evacuated from a preschool across the street from a building that was rocked by an ex

This photo taken from video provided by KABC-TV shows a building after an explosion rocked it in Aliso Viejo, Calif., Tuesday afternoon, May 15, 2018.

The home of a homicide victim, Ildiko Krajnyak, is seen after it was searched by police overnight in Trabuco Canyon, Calif., Wednesday, May 16, 2018.

Orange County Undersheriff Don Barnes speaks to the media on Wednesday, May 16, 2018, in Santa Ana, Calif., regarding a fatal explosion at an Aliso Vi

Paul Delacourt, assistant director in charge of the Los Angeles office of the FBI, speaks to the media on Wednesday, May 16, 2018, at Orange County Sh

Orange County Undersheriff Don Barnes speaks to the media on Wednesday, May 16, 2018, at Orange County Sheriff's headquarters in Santa Ana, Calif., re

ALISO VIEJO, Calif. (AP) — The Latest on a deadly explosion at a Southern California office building (all times local):

6:30 a.m.

The FBI says the investigation into a deadly building explosion in Southern California has led to the arrest of a man on suspicion of possession of an unregistered destructive device.

FBI spokeswoman Laura Eimiller stresses in a statement Thursday that the subject, 59-year-old Stephen Beal of Long Beach, has not been charged in connection with Tuesday's explosion.

Beal's Facebook page shows many photos of him apparently recently traveling with the woman who was killed, 48-year-old Ildiko Krajnyak (IL-di-koh KRY-nyak), a cosmetologist who ran a day spa at the building hit by the blast.

Beal is expected to make an appearance in federal court Thursday afternoon.

Eimiller says no additional details will be provided until a federal criminal complaint is released.

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9:21 p.m.

Authorities are investigating whether a California woman killed in an explosion at the day spa that she owned was targeted.

Officials haven't formally identified the body but said Wednesday they believe it is that of Ildiko Krajnyak (IL-di-koh KRY-nyak), a licensed cosmetologist.

Investigators do not believe the Tuesday afternoon blast in the city of Aliso Viejo was an accident, and items that were possibly part of a bomb have been sent to an FBI lab. There have been no arrests.

Authorities declined to publicly say if they believe Krajnyak was the target, but one official briefed on the investigation told The Associated Press she had been the intended recipient of an explosive package.

Two injured people are expected to survive after surgery and a third was treated at the scene.