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One man died and two others were wounded, including one in grave condition, when gunfire erupted in a residential neighborhood in Sylmar on Sunday afternoon, authorities said.

The violence took place about 6:40 p.m. in the 12900 block of Borden Avenue, just west of Sayre Street, according to Los Angeles Fire Department spokesman Nicholas Prange.

Paramedics encountered three wounded men when they arrived at the scene, he said.

“One was beyond medical help and will be handled by the coroner,” Prange said in a written statement.

Another man was hospitalized in “grave” condition, and a third victim was in “stable” condition, said Joseph Kalyn, commanding officer of the LAPD’s Mission-area Detective Division.

All three victims were described as men in their 20s.

A woman at the scene was examined due to experiencing trauma but was not physically hurt, officials said.

The victims were standing in a front yard during a family gathering when three male attackers wearing all-dark clothing approached, Kalyn said. At least one of them opened fire. They were believed to have fled in a vehicle.

No further details, including a motive or detailed suspect description, were available.

Anyone with information can reach the Los Angeles Police Department at 877-527-3247. Tips may also be submitted anonymously to L.A. Regional Crime Stoppers at 800-222-8477.