Six firefighters taken to hospital after Northwest Dallas house fire

DALLAS - Six firefighters were taken to the hospital on Friday after responding to a fire in Northwest Dallas.

Durango Drive House Fire

What we know:

Dallas Fire-Rescue crews were called to a home for a fire on Durango Drive at 11:02 a.m.

While firefighters battled the blaze, DFR command noticed a change in the smell and color of the smoke. The firefighters were then ordered out of the house.

Investigators later found an unlabeled container that was confirmed to be filled with chlorine.

Six firefighters experienced breathing issues and were taken to Parkland for evaluation. Five have already been discharged. One firefighter will remain hospitalized as a precaution for observation.

No other injuries were reported.

The fire was extinguished before 1 p.m.

What we don't know:

The cause of the fire is under investigation.