At least 33 people have been confirmed dead, including teenagers and a deputy’s son, in a massive blaze that gutted a converted warehouse over the weekend during an electronic dance party. The death toll is expected to rise as crews search the wreckage of the two-story building, which burst into flames late Friday night. Roughly 30% of the building had been searched as of Sunday afternoon, Alameda County Sheriff’s Sgt. Ray Kelly said in a news conference Sunday.

       It could take weeks to identify victims through DNA and dental records, he said. Officials have asked victims’ families to preserve potential DNA samples from such items as their loved ones’ hairbrushes and toothbrushes to assist in identifications.

             He added that officials were also working with the transgender community to identify some of the victims.

The City of Oakland identified the first eight victims Sunday night. One is a 17-year-old minor whose name will not be released, the city said.

The rest have been identified as Cash Askew, 22, David Clines, 35, Donna Kellogg, 32, Travis Hough, 35, all of Oakland; Nick Gomez-Hall, 25, of Coronado, California; Sara Hoda, 30, of Walnut Creek, California; and Brandon Chase Wittenauer, 32, of Hayward, California. The recovery search would be long and arduous as firefighters work to remove debris “literally bucket by bucket in a methodical, thoughtful, mindful and compassionate way,” Oakland battalion Fire Chief Melinda Drayton said. The origin of the fire has still been undetermined.