Two volunteer firefighters, Lt. Mike Chiapperini (pictured) and Tomasz Kaczowka, were shot dead in West Webster, New York, on Monday morning by an unidentified man (videos below).
Police have yet to confirm if the killer used an "assault" rifle to commit the horrible act.
Two other volunteer firefighters, Joseph Hofsetter and Theodore Scardino, had gunshot wounds and were taken to Strong Memorial Hospital, reports Fox News.
Dr. Nicole Staffen said at a press conference that Hofsetter and Scardino have significant injuries but are awake and off ventilators, reports the Associated Press.
John Ritter, an off-duty police officer, was injured by shrapnel when he responded to the scene, reports WHEC NBC 10. No word yet on his condition.
The fire crews were called to a blaze on a property on Lake Ontario at about 6 a.m. After the shooting, police SWAT teams descended on the area.
West Webster Police Chief Gerald Pickering said in a press conference that two firefighters responded to the call on the engine and two responded in their personal vehicles.
Chief Pickering said: "One or more shooters fired at the West Webster firefighters when they arrived on the scene of the fire, which had reached a home. These people get up in the middle of the night to fight fires. They don’t expect to be shot and killed."
"It does appear that it was a trap that was set for responding first responders. The shooter died from a gunshot wound, but we don’t know whether it was self-inflicted or not."
The SWAT team evacuated 33 residents. Four homes were engulfed in flames, and firefighters were still fighting the fire as of 12 p.m. EST.