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Police were looking for suspects and an explanation Wednesday after a man walked into a McDonald's in New York City chatting on a cellphone with a knife in his back.

"He was cool and calm. But you could tell he was shaken up," Michel Green, 43, who described himself as a friend of the victim, told the New York Post. "I went to pull the knife out, but someone said, 'No, no! It might have hit an artery!'"

The man, described as in his 50s, was treated for non-life-threatening injuries, police said. The incident took place in the Jamaica section of Queens.

"I don't know if he was in shock or what the situation was, but he was fine. It was like, 'Just another day in the hood,'" a witness told the Daily News. "It was crazy!"

A food truck worker on the block told the Post the stabbing stemmed from a previous fight. Sean Smith, of Queens, told the Daily News the stabbing was in retaliation for a robbery that took place recently on "the strip." He also blamed rampant drug use in the area, which has a methodone clinic.

"As you can see, the strip is filled with crackheads," Smith said.

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