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The police arrested a man early Saturday and accused him of fatally stabbing a 14-year-old boy on his way to school in a random attack on Friday, Police Commissioner Jessica Tisch said.

The man, Waldo Mejia, 29, was arrested near the location of the stabbing in the Mott Haven neighborhood of the Bronx and charged with second-degree murder, manslaughter and criminal possession of a weapon, the police said. Mr. Mejia was found carrying a bloody knife at the time of his arrest, the authorities said.

The stabbing took place at 9:25 a.m. on Friday in front of 300 East 138th Street shortly after the 14-year-old boy, Caleb Rijos, had left his home nearby to attend the Bronx Leadership Academy High School, the police said. His building, at 175 Alexander Avenue, is part of a housing complex run by the New York City Housing Authority.