A 17-year-old robber’s arm was severed in Brooklyn after he held up a 39-year-old man at gunpoint for a pair of pricey sneakers, police sources said.

Through the app Wallapop, the pair had arranged to meet up at 1 p.m. on Friday in Canarsie.

But when the seller showed up, asking $490 for a pair of Air Jordan 8 Retro sneakers, the teen crook pulled out a gun and demanded the kicks for free inside the older man’s car, police sources said.

The 39-year-old stepped on the gas pedal, but the gunman jumped out of his car at the intersection of East 86th Street and Avenue M, sources said.

Instead of speeding off, the seller turned his car around and drove after the teenager, crashing into him in front of a fence.

The robber’s arm was ripped off when he was pinned against the fence.

I saw a kid under a car,” said Alex Saint Fleur, a bus driver who lives across the street.

“The guy ran him over. He got out, the driver said, ‘He’s trying to rob me. He’s trying to rob me.’”

“I saw the gun on the floor,” Fleur added. “The arm was on the floor near the gun.”

The teen got out from under the car, he said, and ran inside a city bus.

“Everyone is screaming, ‘Come back, come back, your arm. You’re bleeding too much,’” Fleur said.

The crook got out of the bus and started running down Avenue M, he said, before finally collapsing in the street.

The teen was taken to Brookdale Hospital, where he remains in serious but stable condition, law enforcement sources said.

The 39-year-old driver will likely be arrested, according to police sources.

On Friday afternoon, the bus was pulled over on 80th Street, blood spattered on its front entrance.

“I was walking up the sidewalk and I heard a boom behind me,” said a postal worker who declined to give her name. “I just kept it moving. I saw somebody run on the bus with a missing arm.”

$490 for a pair of shoes? What a rip off.

Another one armed bandit.

Yep. The young punk has a future working in a casino.

It will be easier to keep an eye on any underhand dealing he might be contemplating.

Sad part is,
the lazy thieving basterd, now qualifies for a gubbahmint cheque.

Another one armed bandit.

Good one Frank!