Investigators believe an argument triggered a triple shooting that left a 19-year-old man dead in Hunting Park Monday night.

The slaying victim was identified Tuesday morning as Devin Brown of the 400 block of Caskey Street in the neighboring Feltonville section.

Of the other victims, a 22-year-old man was treated for a graze wound to the neck and released and a 16-year-old boy was reported in stable condition Tuesday morning at Temple University Hospital with gunshot wounds to the leg and face, police said.

When neighbors heard the gunfire in Hunting Park erupt Monday night, they knew too well what to do.

"Go lay on the floor and lock all the doors," said one 33-year-old mother who gave her name only as Anet, adding she heard more than 10 shots. "This ain't the first time, and it ain't gonna be the last."

Police said gunfire from at least two weapons broke out just after 7:30 p.m. at Darien and Lycoming streets. Brown, shot once in the back, was pronounced dead at the scene at 7:45 p.m.

Initial reports indicated the 22-year-old man wounded in the shooting was being held as a prisoner, but that could not be verified Tuesday mooring.

Police also said a man in a red hooded sweatshirt, blue jeans and black sneakers was seen running east on Lycoming after the shooting.

Cops found 15 shell casings from two different weapons at the scene, Chief Inspector Scott Small said.

Neighbors watched through the rain as cops swarmed the block and crime-scene investigators placed yellow markers on the street.

Tears stained the cheeks of a 13-year-old girl who spoke on condition of anonymity about the aftermath of the bloodbath.

"I came outside and saw him laying there," she said of Brown, adding that she didn't know him but recognized him from the neighborhood. "I just saw him yesterday and he told me, 'You're gonna make it in life.'"

She cried, "I didn't believe my eyes. I came back around and had to look again."

Small said a surveillance camera outside a house captured part of the shooting and investigators were reviewing the footage.

Anet and another young mother, who gave her name only as Eva, 35, stood on the corner and shook their heads. Each said she was raising three young children in the neighborhood.

"It's not even safe for the kids to go to the park," Eva said.

"Even in the morning when we're getting [my son] on the bus, we've got to be careful. ... It's gotten to be very dangerous."

Contact Morgan Zalot at 215-5928, zalotm@phillynews.com, or follow on Twitter @morganzalot.