New York City police say they're looking for at least five black youths in connection with the burning of a Jewish school bus.

An 11-year-old boy already has been arrested in the Sunday fire and is being charged with arson as a juvenile.

Police Chief of Detectives Robert Boyce said Tuesday the group of youths took cardboard boxes on the unlocked bus and set them on fire. The case is being investigated as a possible hate crime.

It was the third recent possible hate crime in Brooklyn's Crown Heights neighborhood, site of race riots in the early 1990s. The driver's side mirror on a bus from a different school was smashed with a brick Friday. And a man dressed in religious Jewish clothing was punched in the face by a 13-year-old boy who was arrested Thursday.