At least 36 people have been confirmed killed in the Oakland warehouse fire. Authorities continue to search wreckage as deceased victims of Friday’s deadly blaze are located.

In this photo, a fireman stands before a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California.

Oakland Mayor Libby Schaaf announced Sunday afternoon that a criminal investigation has been opened into the incident, although no cause has been determined yet.

This Dec. 3, 2016 still frame from video provided by KGO-TV shows the Ghost Ship Warehouse after a fire swept that started late Friday swept through the Oakland, Calif., building. 

The building that went up in flames was known as the “Ghost Ship,” and had been carved into artist studios and was an illegal home for a rotating cast of a dozen or more people, according to former denizens who said it was a cluttered death trap with few exits, piles of wood and a mess of snaking electric cords.

In this photo, the warehouse is seen after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California

A deadly fire that broke out on Dec. 2, 2016, at a warehouse in Oakland, California.

A fireman seals off an entrance to a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California.

A firefighter carries equipment at the scene of a fire in the Fruitvale district of Oakland, California, Dec. 4, 2016. 

Oakland City Council Member Larry Reid (L) embraces Mayor Libby Schaaf after a new conference at the scene of a fire in the Fruitvale district of Oakland, California, Dec. 3, 2016. 

People embrace during a vigil at the Chapel of the Chimes for the victims of a fire in the Fruitvale district of Oakland, California, Dec. 3, 2016. 

A firefighter carries a water hose near a warehouse where a deadly fire broke out in the Fruitvale district of Oakland, California, U.S. Dec. 3, 2016. 

Flames rise from the top of a warehouse, which caught fire in Oakland, California, on Dec. 2, 2016.

A man places flowers at a makeshift memorial near the scene of a fire in the Fruitvale district of Oakland, California, Dec. 4, 2016. 

Sign indicating a private party is seen at an entrance to a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California.

A memorial is seen near the site of a warehouse fire that has claimed the lives of at least thirty-three people on December 4, 2016 in Oakland, California. 

The Alameda County coroner’s van is seen near a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California.

People gather near a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California. 

A warehouse smolders after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California. 

A firetruck is reflected in the window of a shop next door to a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California. 

Firemen stand near a warehouse after it was destroyed by a fire, Dec. 3, 2016 in Oakland, California.

A memorial is seen near the site of a warehouse fire that has claimed the lives of at least 36 people on Dec. 4, 2016 in Oakland, California.