Aliso Viejo explosion victim ID'd as Trabuco Canyon woman; blast came from 'device,' officials say

ALISO VIEJO, Calif. -- Officials believe the explosion that killed a 48-year-old woman in Aliso Viejo was no accident, and that the blast came from a device delivered to the location.

Speaking at a news conference on Wednesday, Orange County Sheriff's Department Undersheriff Don Barnes identified the victim as Ildiko Krajnyak-Vestil of Trabuco Canyon.

The explosion that left a 48-year-old woman dead was not an accident and is believed to have come from a device delivered to the location, officials said.

Three others were injured in the blast - two are expected to survive after surgery and a third was treated at the scene for smoke inhalation and released.

MORE: Aliso Viejo deadly explosion likely an intentional act, official tells AP

FBI official Paul Delacourt said it appeared the explosion came from a device delivered to the location, though he did not know how the item was delivered. He said items that were possibly part of an explosive device have been sent to an FBI lab.

Three search warrants have been served in connection with the investigation - at the day spa business where the blast occurred, at a location in Long Beach and at another location in Trabuco Canyon, investigators said.

WATCH: Leo Stallworth reports from Long Beach, where a search warrant was served at a home in connection with Aliso Viejo investigation

A home in Long Beach was searched by FBI agents and other authorities in connection to the deadly Aliso Viejo explosion.

FBI agents were seen removing boxes believed to contain evidence from a home along Dover Court in Trabcuo Canyon Wednesday morning. The home is believed to be Krajnyak-Vestil's residence.

Neighbors said Krajnyak-Vestil worked as an aesthetician at the medical office building on 11 Mareblu, where the blast occurred Tuesday. Barnes said she was likely the owner of the day spa there.

A neighbor who lives across the street from the Drover Court residence captured home surveillance footage of a man described by the neighbor as Krajnyak-Vestil's husband arriving home around 1 a.m. Wednesday. Two hours later, the footage shows several large, unmarked vehicles arriving and FBI agents getting out and approaching the home.

Area residents said the flurry of activity has come as a shock to them.Residents around the neighborhood also set up a GoFundMe account to help the family bring Krajnyak-Vestil's only son home from college and for the funeral.

If you want to donate, you may do so by going to gofundme.com/ildikokrajnyakmemorialfund.

No arrests have been made. Officials said other potential causes such as a gas leak have been ruled out.

Several businesses along Mareblu remained closed on Wednesday.

If you have any relevant information about this case, you're urged to contact authorities at 1-800-CALL-FBI.