Three injured as 4 alarm fire burns NW Oklahoma City apartment complex

Three people were hospitalized following a 4-alarm fire at a northwest Oklahoma City apartment complex.

The fire broke out just after 5:00 a.m. Thursday morning at the Ambassador House Apartments near NW 46th and Penn.

Firefighters arrived to find flames shooting out of the back of the complex. Officials say the fire quickly spread.

Click here for photos from the scene.

Residents were evacuated while firefighters tried to gain the upper hand on the fire. It took firefighters about 1 1/2 hours to put out the blaze.

Because of the size of the flames, crews closed Pennsylvania from I-44 to Northwest expressway around 6:30. Just before 9:00, it was reopened to traffic.

Fire officials say victims include 2 residents who were burned and 1 EMSA paramedic who is suffering from smoke inhalation.

The original fire call was for a mattress on fire in an upstairs unit.

No word on what may have caused the fire.