Rescue workers have found 24 bodies in the ruins of a loft building in Oakland, California, after a devastating blaze during a party.

As many as 100 party-goers were at the "Rave Cave" club night in the two-storey warehouse in Oakland, California, when the enormous blaze broke out at 11.30pm local time.

Footage on social media showed the building engulfed by thick plumes of black smoke as firefighters battled the fire through the night.

Authorities have warned they expect the death toll to rise, with as many as 100 revellers believed to have been at the 'rave cave' club night event when the fire broke out at 11.30pm local time on Friday.

Investigators say they have not yet found the cause of the fire.