At least two firefighters died when they were shot at the scene of a blaze in upstate New York on Monday, police said.
Two other firefighters were injured, police in Webster, New York, told reporters.
Authorities believe one or more shooters took aim at the firefighters after they left their vehicles, Police Chief Gerald Pickering said.
It was unclear whether there were any suspects.
"We have different individuals that were possible people with knowledge, but at this point I can't really comment," Monroe County Sheriff Patrick O'Flynn told reporters.
For hours, the gunfire stopped firefighters from working to extinguish the fire and forced police SWAT teams to evacuate homes in the area.
Firefighters first arrived before 6 a.m., said Rob Boutillier, Webster's fire marshal. By 9 a.m., flames had engulfed three houses and a vehicle, he said.
"It's still an active crime scene," Pickering said. "We have firefighters there at the location. It took a while to make it safe ... to put out the fires."
Doctors were treating the wounded firefighters Monday morning, said Teri D'Agostino, a spokeswoman for Strong Memorial Hospital in Rochester, New York. They were in guarded condition, she said.
One firefighter escaped from the scene in his own vehicle about an hour after he was shot, then was taken to the hospital by an ambulance from another location, Boutillier said. He was listed in satisfactory condition, Boutillier said.
Another wounded firefighter was conscious and speaking when he was removed from the scene, Boutillier said.
CNN
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Officials: NY Gunman Set 'Trap' for Firefighters
A man who set his house on fire then lured firefighters to their deaths in a blaze of flames and bullets had attracted little attention since he got out of prison in the 1990s for killing his grandmother, authorities said.
But two months ago, William Spengler's mother died, leaving the 62-year-old ex-con in a Lake Ontario house with his sister, who he "couldn't stand," a friend said.
Spengler set a car and a house in his neighborhood ablaze early Monday, luring firefighters to the neighborhood and then killed two, wounded two others and injured a police officer while several homes burned around him, police said. Spengler then killed himself. His sister, Cheryl, was missing.
About 100 people attended an impromptu memorial vigil Monday evening in Webster, a suburb of Rochester. Dozens of bouquets were left at the fire station, along with a handwritten sign that said, "Thanks for protecting us. RIP."
Spengler, had been living in the home in Webster, a suburb of Rochester, with his mother and sister since his parole in 1998. He had served 17 years in prison after the beating death of his 92-year-old grandmother in 1980, for which he had originally been charged with murder but pleaded guilty to a reduced charge of manslaughter. His mother, Arline, died in October.
ABC News