Around 7pm, Stratford Tac 5 came upon a structure fire on Columbus Ave and asked for a 2nd Alarm, bringing all frontline units in the city to the scene and mutual aid form Bridgeport and Milford for coverage. Companies had heavy fire blowing out the windows from all floors of the A/B side of a 2 1/2 story duplex, companies quickly knocked the fire and worked on extensive overhaul.