Four people were injured Tuesday afternoon after a fire broke out at a northwest Harris County home.

The fire started in the garage of a 2-story home in the 14400 block of Lawton Ridge at Spring Barker Drive at around 12:15 p.m.

A grandfather was working in the front yard when he noticed smoke coming from the house. He got a ladder and broke out a second story window in an attempt to rescue his 43-year-old son.

"I went and got my extension ladder because my son was asleep upstairs and he's deaf. I had to get him out because he's deaf and he didn't know anything was happening,"said James Osteen, the owner of the house.

A 12-year-old girl, who firefighters say is a family member, was already inside trying to get him out because he is hearing impaired and could not hear the smoke alarm.

Firefighters arrived and used ladders to pull the man from the second floor.

Both the man and girl were taken to the hospital to be treated for smoke inhalation. They were later released from the hospital and are expected to be OK.

"We did have heavy smoke load in the house which can be very dangerous to anyone in that smoke with all the gases in there," said Brian Shirley with the Cy-Fair Volunteer Fire Department.

Two responders were also injured. A Cy- Fair firefighter was hurt after hitting his head and an investigator with the Harris County Fire Marshal’s Office fell in the garage and injured his knee.

They, too, were also expected to be fine, but the investigator was also transported to the hospital as a precaution. He was later released.

Investigators say it appears the cause of the fire was a discarded cigarette butt in the garage.