More than 30 people were displaced when a four-alarm fire tore through two buildings in Oakland’s Fruitvale neighborhood late Wednesday.

The blaze was reported behind 2332 International Blvd. east of 23rd Avenue about 10:45 p.m. and quickly grew to four alarms. The fire jumped to a second building at 2334 International, according to the Oakland Fire Department.

TUNE IN AT 6:31 AM: @KatieABC7 will have the latest on a devastating fire in Oakland that has displaced 34 residents. pic.twitter.com/K9FqLlfmrv — ABC7 News (@abc7newsBayArea) August 21, 2014

The flames were so intense at one point that firefighters were ordered to evacuate the structures and fight the blaze “defensively,” spraying water from outside with the help of two ladder trucks.

23rd Ave- emergency tones from command. All members requested to evacuate building. Crews going defensive. #oaklandfire — Oakland Firefighters (@OaklandFireLive) August 21, 2014

No injuries were reported to residents or firefighters. Authorities said 33 people, including six children, were displaced by the fire. The American Red Cross opened a shelter and was helping the residents to find housing.

The cause of the fire is under investigation. Fire officials were looking into whether fireworks found in a patio behind one of the buildings ignited the blaze.

“People reported hearing some loud explosions in the area, and remnants of fireworks were found, but we’re not at this point saying it’s the cause,” said Battalion Chief Lisa Baker.

23xInter- all members accounted for. Initial report- Two 2 story buildings with heavy fire plus exposures. Crews are now defensive. #oakland — Oakland Firefighters (@OaklandFireLive) August 21, 2014

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