UPDATE: Divers found the body of last missing victim from the boat fire off the Southern California coast that killed 34 people last week.

Authorities say they have now identified all 34 victims of a boat fire off the Southern California coast.

 

The Santa Barbara County Sheriff's Office added the last seven names on Thursday. They include a Connecticut couple and several people from Silicon Valley.

 

DNA testing helped identify them.

 

The scuba diving boat Conception burned and sank off Santa Cruz Island before dawn on Sept. 2. The passengers and one crew member were trapped in a bunkroom below deck. Five crew members survived.

 

The National Transportation Safety Board issued a report Thursday that said all six crew members were asleep.

 

That's a violation of the Coast Guard's rules. Boats like the Conception are required to have a crew member keep watch at night.

 

Federal authorities are conducting a criminal investigation into the deadly fire.

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Original Story: The remains of 18 people killed in a fire on a California scuba diving boat have been identified.

Santa Barbara County Sheriff Bill Brown said Friday that identifications require DNA analysis because of the fire's intensity early Monday aboard the vessel Conception.

Brown told reporters that the families of all 34 victims have been contacted to collect DNA samples.

The sheriff says the FBI helped with that effort across the U.S. and internationally. Brown says one relative was a mother in Japan, another was in Singapore and another flew in from India.

Authorities have found the remains of 33 people and are searching the ocean for the remaining missing victim. They also are trying to recover the sunken vessel.

Sheriff Brown announced the nine names during a press conference: 

Raymond Scott Chan, 59, of Los Altos

Justin Carroll Dignum, 58, of Anaheim

Daniel Garcia, 46, of Berkeley  

Marybeth Guiney, 51, of Santa Monica

Yulia Krashennaya, 40, of Berkeley

Alexandra Kurtz, 25, of Santa Barbara

Caroline McGloughlin

Ted Strong, 62, of Germantown, Tennessee

Wei Tan, 26, of Goleta

Earlier, the University of Nevada told us that one of the 34 people who died in this week's diving boat fire included a 1989 computer science graduate. 

UNR says Steve Salika graduated with a bachelor’s degree in computer science from the College of Engineering. 

He most recently worked for Apple. In a statement, Apple said, "Steve was a 30-year Apple veteran whose energy and enthusiasm touched so many people..."

Meanwhile, U.S. authorities are investigating potential ignition sources of a deadly fire on a scuba diving boat, including electronics aboard the vessel.

Jennifer Homendy, a member of the National Transportation Safety Board, said Thursday that investigators know photography equipment, batteries and other electronics were stored and plugged in on the Conception.

She said officials are not ruling out any possibilities as they probe what caused the blaze that killed 34 people.

Homendy also said she inspected a vessel similar to the Conception and was concerned about the accessibility of its escape hatch.

The Conception had been in full compliance with Coast Guard regulations.

Homendy says that the captain, the boat's owner and others underwent hours of detailed questioning. She won't disclose details.

The captain and four crew members are the only survivors of a pre-dawn Labor Day fire aboard the Conception off the Channel Islands.

Authorities say they were on deck, while those sleeping below were trapped by the quick-moving blaze.

All but one body has been recovered.

Homendy says crew members were given alcohol and drug tests. She says the alcohol tests were negative, and the drug results are pending.

The boat's fire protection systems will also be checked. The Coast Guard says the vessel wasn't required to have sprinklers.

Coast Guard Lt. Zach Farrell said Wednesday that 13 bodies were recovered Tuesday and that one person is still missing.

Farrell spoke on behalf of an interagency joint information center representing local, county, state and federal officials.

Santa Barbara County Sheriff Cmdr. Kevin Huddle says medical examiners worked overnight from Tuesday into Wednesday to examine remains found so far and identify the victims. 

Huddle said updates on bodies recovered would come after autopsies begin.

On Tuesday, a relative said that five people from one Northern California family were missing and presumed dead.

Susana Rosas posted on social media that her three daughters, their father and stepmother were on board the Conception when it caught fire before dawn Monday morning.

Sheriff Bill Brown said Tuesday the fire that gutted the vessel Conception early Monday was extraordinarily hot.

The sheriff says most victims appear to have been from Northern California, including Santa Cruz, San Jose and the San Francisco Bay region.

Brown says he doesn't have exact information on the victims' ages but cited anecdotal reports of a 17-year-old and some adults in their 60s.

Thirty-nine people including six crew members were aboard the vessel Conception when it caught fire early Monday morning while anchored off Santa Cruz Island.

Commander Jay Donovan of the San Luis Obispo County Sheriff's Office said Tuesday that the divers from multiple law enforcement agencies are using their hands because of limited visibility and search in grids.

They say this is the worst case scenario as most people on board were asleep and the sleeping compartment on the ship was on the bottom floor. When the Coast Guard was notified, the vessel was already totally engulfed in flames.

The vessel was inspected yearly and is in full compliance.

Police have interviewed the five crew members who survived a boat fire off the Southern California coast.

No cause for the fire has been identified and at this stage there's no reason to believe it involved a criminal act.

Officials say Coroner's Offices in Los Angeles and Sacramento will assist with this incident due to the size.

Santa Cruz Island is off the coast of Santa Barbara.

Conception was operated by Santa Barbara-based Worldwide Diving Adventures, which says on its website it has been operating such expeditions since 1972.

This weekend trip had departed at 4 a.m. Saturday with plans to return at 5 p.m. Monday.

It was outfitted with dozens of small berths for people to sleep in overnight.

The trip promised multiple opportunities to see colorful coral and a variety of marine life.

(The Associated Press, CBS News contributed to this report.)