TUCSON, Ariz. (AP) — Two residential fires on Sunday left two Tucson firefighters, one police officer and a resident sick or injured.

The first fire was around 1:30 a.m. on Sunday and damaged four apartments, leaving several families displaced.

A Tucson police officer suffered minor smoke inhalation after helping evacuate residents of the apartment fire.

A second fire about four hours later left one firefighter hospitalized with burns and another with nausea.

That blaze at a house was large and took over 30 minutes to extinguish. One of the residents suffered burns and was hospitalized.

Both fires required firefighters to cut a hole over the roof to let out help them see and to let smoke and gas escape.

The fire department is investigating the cause of the fires.