A 70-year-old Elmont man died in a house fire early Saturday despite efforts by his son and firefighters to save him, police said.

When firefighters responded to a home on Dutch Broadway at 12:20 a.m. they found a man, 31, who had escaped after he unsuccessfully tried to reach his father, who was trapped by the fire in an upstairs bedroom, Nassau County police said in a news release.

After subduing some of the flames, firefighters reached the bedroom and found the older man, who was unconscious, police said. Firefighters brought him outside to start resuscitation efforts, and he was taken to a hospital, where he was pronounced dead, police said.

The name of the victim was not immediately released by police.

Fire departments from Lakeview, Franklin Square, Valley Stream and West Hempstead continued battling the fire until it was extinguished.

One Elmont firefighter suffered minor burns to his upper legs and was taken to a hospital for treatment. The older man’s son also was taken to a hospital for treatment for minor smoke inhalation.

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The cause of the fire is under investigation but does not appear to be suspicious, police said.

Workers on Saturday morning placed wooden boards over the home’s empty window frames.

Muhammad Aswad, 36, a print shop owner who has lived next door for three years, said he was at home with his wife, children, mother and brother-in-law when he heard banging outside“I thought it was a car accident,” he said.

Aswad said he ran outside and saw smoke coming from his neighbor’s windows.

“It was so smoky, you couldn’t even see six feet,” Aswad said.

He ran over to help a man who was attempting to kick down the front door, Aswad said, but the smoke was so thick that he returned to his porch, where his brother-in-law was calling the police.

Aswad then saw the son of the man killed in the fire run out of the house wearing shorts, he said.

Aswad said the father and son lived together in the home, the son in the basement.

“He was a good guy,” Aswad said of the older man. “I feel very bad. Very sad.”