BALTIMORE (AP) — Baltimore’s fire chief says an injured firefighter is conscious and alert, one day after the collapse of a vacant rowhome on fire that killed three other firefighters. The four firefighters became trapped early Monday in the partial collapse of the vacant three-story home as they battled the flames. One firefighter was pronounced dead the scene and two others at a hospital. But crews pulled away debris to free EMT/Firefighter John McMaster, and he was initially reported in critical condition and on life support Monday night at Maryland Shock Trauma. Fire Chief Niles Ford said at midday Tuesday that McMaster’s condition was now upgraded to fair.