TUSTIN, CA - FEBRUARY 12 , 2020 - A five-alarm fire that caused the roof of a building in a two-story apartment complex in Tustin to collapse today left two residents injured, and firefighters were working to douse hot spots and determine if anyone was unaccounted for. The fire was first reported at 3:01 a.m. at 15751 Williams Street, near McFadden Avenue, according to the Orange County Fire Authority. (Irfan Khan / Los Angeles Times)

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Fire tears through O.C. apartment complex

Firefighters start to mop-up after battling a five-alarm fire at an apartment complex in Tustin. (Irfan Khan/Los Angeles Times)

TUSTIN, CA - FEBRUARY 12 , 2020 - A neighbor comforts Gigliola Macias, right, displaced by fire. A five-alarm fire that caused the roof of a building in a two-story apartment complex in Tustin to collapse today left two residents injured, and firefighters were working to douse hot spots and determine if anyone was unaccounted for. The fire was first reported at 3:01 a.m. at 15751 Williams Street, near McFadden Avenue, according to the Orange County Fire Authority. (Irfan Khan / Los Angeles Times)

A neighbor comforts Gigliola Macias, right, displaced by fire. (Irfan Khan/Los Angeles Times)

TUSTIN, CA - FEBRUARY 12 , 2020 - Arson investigators at the scene of fire. A five-alarm fire that caused the roof of a building in a two-story apartment complex in Tustin to collapse today left two residents injured, and firefighters were working to douse hot spots and determine if anyone was unaccounted for. The fire was first reported at 3:01 a.m. at 15751 Williams Street, near McFadden Avenue, according to the Orange County Fire Authority. (Irfan Khan / Los Angeles Times)

Arson investigators at the scene of a five-alarm fire that caused the roof of a building in a two-story apartment complex in Tustin to collapse. (Irfan Khan/Los Angeles Times)

A five-alarm fire in a two-story apartment complex in Tustin left two residents injured. (Irfan Khan/Los Angeles Times)