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A two-alarm fire at an apartment building in Berkeley was controlled this morning after burning for nearly four hours, a deputy fire chief said.

The fire was reported at 4:13 a.m. at 2227 Dwight Way, a six-unit building located a few blocks from the University of California at Berkeley campus, Berkeley Deputy Fire Chief Gil Dong said.

The roof of the building collapsed, making it difficult for firefighters to access various hot spots that remain from the blaze, Dong said. The fire was under control at 8:05 a.m., he said. 

All residents were safely evacuated from the building, according to Dong. He said fire officials were working to count how many residents had been displaced. 

No injuries to any civilians or firefighters were reported because of the fire, he said. 

Dwight Way is closed between Fulton and Ellsworth streets and will likely remain shut down throughout the day while crews watch for hot spots and investigate the fire, Dong said. 

The cause of the blaze had not yet been determined as of this morning, he said.