Updated at 7 p.m. ET Sunday.
Officials say they have so far recovered 33 victims killed in a warehouse fire in Oakland, Calif., and say there may be more.
The fire broke out around 11:30 p.m. Friday during an electronic music show at the "Ghost Ship," an artists' collective in Oakland's Fruitvale neighborhood.
As of Sunday afternoon local time, searchers had been through "35 to 40 percent" of the building, said Sgt. Ray Kelly of the Alameda County Sheriff's Department Coroner's Bureau at a news conference.