The fire started shortly before 3 p.m. Thursday, reportedly in a laundry room. Fire officials are still investigating exactly how it began.
About an hour after the fire began, officials with the Houston Fire Department said one firefighter had been injured and was taken to a nearby hospital.
Later, HFD officials clarifed that the firefighter injured his shoulder while fighting the fire.
According to fire officials, at least 16 units suffered damage, either directly from the fire, or from smoke or water. They said 24 adults and 16 minors have been displaced. The Red Cross is assisting those residents.
Additionally, a puppy died during the fire, authorities say.