MT. VERNON — — Mt. Vernon Fire Department responded to a house fire at 604 S. 19th St., at 7:51 p.m. on Thursday night. The entire back porch of the home was fully engulfed when firefighters arrived at the scene, and according to officials at the time of the fire, two people are believed to have escaped from the home before the flames spread. Firefighters were still at the scene at press time on Thursday, and no other details were available.