(KRON) — Firefighters in San Jose responded Thursday morning to a duplex fire on Union Avenue.

Fire crews were dispatched at 5:56 a.m. to the residential blaze at 2912 Union Avenue. The response escalated to a second alarm, and the fire continued to burn until it was knocked down just before 8 a.m., SJFD said.

(Photo: San Jose Fire Department)

(Photo: San Jose Fire Department)

(Photo: San Jose Fire Department)

(Photo: San Jose Fire Department)

During firefighting efforts, crews had to withdraw from the inside of the home after the roof collapsed. Firefighters then moved to defensive operations with aerial water streams.

All occupants of the duplex were able to get out, according to officials.

(Photo: San Jose Fire Department)

(Photo: San Jose Fire Department)

Traffic in the vicinity was being impacted by working fire crews, SJFD said. People were advised to avoid the area.

The cause of the fire remains unknown.

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