A suspect in an attempted murder who escaped NYPD custody in Harlem while still wearing handcuffs remained on the loose Wednesday night as internal affairs investigators tried to determine how he was able to break free, officials said.

Tareek Arnold, 23, of Harlem, shoved and assaulted an NYPD detective just before 8 p.m. Tuesday as he was being led to a police vehicle at the 32nd Precinct for a ride to a booking facility, police said. Arnold then ran off, his hands cuffed behind his back, according to a police spokesman.

He sprinted west on 135th Street, and then, according to police, was last seen running north at 134th Street and Frederick Douglass Boulevard.

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Arnold lived at 2400 Adam Clayton Blvd., the spokesman said. His residence is five blocks north of the Harlem precinct. He was arrested Tuesday on charges that he shot another man several times on June 8 near his residence.

The victim survived, and Arnold, who was described as about 5-foot-6 and weighing about 160 pounds, faced charges of attempted murder in the second degree and assault, investigators said.

Witnesses told investigators that Arnold was last seen wearing gray sneakers, a white T-shirt, gray sweatpants, and a gray hooded sweatshirt. Police said he has two tattoos, one that says "Troll" and another that says "Militant Soldiers."

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A spokeswoman for the Manhattan district attorney's office, which was to handle Arnold's arraignment, declined to comment and referred all questions to the NYPD.

The internal affairs review of the escape is standard procedure in such cases, said an NYPD spokesman.

Police suspect that Arnold would likely be able to find someone in his neighborhood to help remove the handcuffs.