Emergency crews responded to a fire at an apartment complex in southwest Houston Tuesday evening, authorities said.

The Houston Fire Department said about 100 firefighters were dispatched to an apartment complex in the 5400 block of Braesvalley Drive around 6:30 p.m.

Officials reported that the situation escalated into a 2-alarm fire. The apartments impacted had no power and were all vacant, according to HFD.

Fire officials said that there were no civilians injured, but there was one firefighter injured, who was taken to a hospital, where he is listed in stable condition.

An investigation is ongoing, and the cause of the fire remains unknown.

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