Wisconsin DJ 'heartbroken' over California warehouse fire, 24 confirmed dead

It's feared that the death toll from the fire could rise as high as 40.

A Wisconsin DJ and electronic artist who was playing the night of the massive warehouse fire that has so far claimed two-dozen lives is "heartbroken" over the tragedy.

Madison-based Joel Shanahan, who performs under the stage name Golden Donna, was the headlining act at a party in Oakland held by his electronic music label 100% Silk as part of his west-coast tour Friday night, according to AV Club.

A fire broke out and it was announced on Sunday morning that 24 people have been confirmed dead, with the LA Times reporting that as many as 40 are feared to have died.

post on Shanahan's Facebook page written on his behalf, it says he is "safe but like many people he is heartbroken and has several friends among the missing."

"Sending love to everyone affected by this horrific event," it adds.

The roof on the warehouse building caved in after the fire started, with the LA Times reporting it's making the search more difficult.

It's not clear at this stage what started the fire, and though arson isn't thought to be behind it, authorities haven't ruled it out at this stage.

According to USA Today, the warehouse had been illegally turned into studios and living spaces for local artists.

Oakland assistant fire chief Mark Hoffman described the building as "a labyrinth of little areas."

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