A massive fire gutted a three-storey downtown apartment building Saturday night.

The two-alarm blaze broke out just after 1:30 Saturday morning at the corner of Carlton Street and Qu'Appelle Avenue, said officials.

One fire fighter sustained minor injuries, but no one else was hurt. Officials say part of the building might have been vacant at the time.

Damages are estimated at $500,000.

Officials say the cause is still under investigation.