The two jihadist brothers who bombed the Boston Marathon were headed to New York afterward “to party,” Police Commissioner Ray Kelly revealed today.

The surviving brother, 19-year-old Dzhokhar Tsarnaev, has told investigators from his Boston hospital bed that he and his brother Tamerlan Tsarnaev, 26, wanted to get some R&R after the bombings, which killed three and injured 170 others at the Marathon finish line April 19.

“The information that we received said something about partying or having a party,” Kelly said, citing what Dzhokhar told investigators. “The bit of information we have they may have been words to the effect of coming to party in New York”

Last Friday, the Tsarnaev brothers murdered an MIT cop in Cambridge, Mass., then hijacked a Mercedes-Benz SUV driven by a Chinese man whose ATM card they used to get some money.

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The Boston Globe yesterday reported the man told cops that while the brothers trained guns on him, Tamerlan warned, “We just killed a cop. We blew up the marathon. And now, we’re going to New York! Don’t f–k with us.”

The man also said the brothers told him they were stealing money from his bank account to fund that trip.

Today, Kelly said that the NYPD only has been told that the Chinese man heard a word that sounded like “Manhattan” while the Tsarnaev brothers were talking in a foreign language.

Kelly also said there is no indication that the Tsarnaevs planned to commit a terrorist act in New York.

“There was some information that they may have been intent on coming to new York, but not to continue what they were doing,” Kelly said.

But he also said that investigators are trying to determine who the brothers might have known in New York City, and what they planned on doing here once they arrived.

Kelly noted that Dzhokhar had visited the Big Apple last November. He said cops are trying to determine if there were other times that he came to New York.

Investigators have found a photo that shows a smiling Dzhokhar and some pals standing in Times Square. It is not clear when that photo was taken, but Kelly said it appears to have been taken during last November’s visit.

The brothers never made it to the city last week.

Tamerlan was killed early Friday during a wild shoot-out with cops in Watertown, Mass., after the carjacked Chinese man escaped from the brothers’ clutches.

Dzhokhar, bloody and suffering from gunshot wounds, was nabbed hiding in a dry-docked boat in Watertown about 20 hours later by the boat’s owner.

He since has been charged with the horrific bombing, and has admitted to pulling off that plot, as well as to killing MIT cop Sean Collier, 26, with Tamerlan.