WESTMORELAND, N.Y. (AP) -- A 19-year-old volunteer firefighter who was so enthusiastic about his new job that he occasionally slept at the fire hall has died during a training exercise.

The trainee, Bradley Golden, and two other young firefighters became trapped on the second floor of an abandoned house where firefighters had set a sofa bed on fire to create smoke for a rescue drill. Up to 40 firefighters were taking part in the exercise Tuesday.

``The couch just started burning out of control and (the flames) went right up the stairs,'' said Bob Walsh, first assistant chief of the Westmoreland Fire Department, which hosted the training.

Wearing full protective gear, the three teens had climbed to the second floor to search for firefighters placed in the house to pose as victims. The three became trapped by the fast-moving flames, which Walsh said appeared to be ``fueled by fresh oxygen.'' State and local fire marshals are investigating.

The two teens who became trapped with Golden, 19-year-olds Adam Croman and Benjamin Morris, were hospitalized with severe burns.

Croman escaped by jumping out a rear window. He was listed in serious condition Wednesday. Morris was pulled from the burning structure by fellow firefighters and was in fair condition.

Golden was less than three months into his training when he died. His exact cause of death is under investigation.

``He was a quiet kid but you could tell he really enjoyed being a firefighter. He would do anything the chief asked. There were times we couldn't get him to leave,'' said John Klein, the department's vice president.