. Gaston for NY Post

6 An officer at the scene examines a shell casing after the deadly shooting. Tomas E. Gaston for NY Post

Heartbreaking security footage shows the youngster stumbling back into the shop clutching his chest before he collapses.

The tragic youngster's father is retired NYPD Sgt. Jesus Freytes, who worked in The Bronx, sources said.

The shooting, which also left two combatants wounded, devastated the young victim's family, with his mom so distraught that neighbors said she was staying at a local hotel because she could not bear the pain of being home.

 She's not OK,  Jacob's aunt sobbed.  She can't come down here. She can't, I'm sorry. 

Sources said police have a person of interest in custody, but no charges have been filed and police are trying to determine what sparked the bloodshed.

 He was a bright kid,  Calon said of Jacob.  He's a good kid. He always saluted me.

 He played sports, he's always playing here in the front court. I've known him for 10 of his 12 years. I saw him grow up.

 I don't understand,  he added.  I'm feeling for the family right now, especially his mom.