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A teenage driver fleeing cops in a stolen SUV slammed into another vehicle on Long Island over the weekend, killing an elderly couple in the other car, as well as his own half-brother, authorities said Sunday.

Nahriek Belford, 17, had blown a stop sign on Main Street in Yaphank around 11:45 p.m. Saturday — right in front of Suffolk County cops, officials said.

The police officers then peeled out after the gray 2015 Nissan Rogue, authorities said.

When Belford refused to pull over, the cops radioed for back-up. They then stayed on him for a 5-mile pursuit along Route 25, according to authorities.

The cop chase came to an abrupt and violent end at Birchwood Park Drive in Middle Island, where the stolen Nissan T-boned a 2009 Honda CR-V driven by an elderly couple turning into their gated retirement community, cops said.

Jerome and Randee Weingarten, ages 74 and 71 respectively, were killed as the two vehicles collided into a mass of jagged metal and plastic, police said.

In the Nissan, Belford’s 19-year-old half-brother, Angelo, was also killed, according to officials.

First responders freed the only two survivors, Nahriek and his 16-year-old second passenger, Jaquell Funderburke, from the twisted hulk and rushed them to Stony Brook University Hospital.

Their injuries are serious, officials said, but both teens are expected to survive.

Belford of Bellport was charged Sunday with reckless endangerment, but is expected to face added charges once he recuperates, authorities said.

His father, wearing a sullen expression, declined to comment outside the family home Sunday.

“No, can’t talk now” the dad said before rushing off.

His teen son is believed to be responsible for stealing the Nissan off Montauk Highway in East Patchogue on Thursday — and replacing its license plates with a pair of decoy ones to throw off the heat, cops said.

But Suffolk police are also looking at their own actions in the minutes leading up to the deadly collision, including whether their officers should have carried on the pursuit along the wood-lined state road, department sources said.

“They are not supposed to pursue high-speed chases,” said one department insider, adding that internal investigators might “pull the radio transmissions” of the officers involved.

Cops on Sunday declined to reveal exactly how fast the Nissan and the police vehicle were traveling, citing a pending probe into whether proper protocol was followed.