Several Altoona residents were left homeless this morning after fire caused serious damage to a townhome on 5th Avenue and 40th Street. The two alarm fire was called in around 1:30 this morning, and caused damage to two neighboring homes as well. All three structures have reportedly been condemned. At one point this morning a city firefighter fell through to the basement from the first floor but fortunately was not injured. The cause of the fire is under investigation.