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Richard Drew, Associated Press
A pair of New York City Police Department officers guard the school bus that was burned Sunday May 8, 2016, in the Crown Heights section of the Brooklyn borough of New York, Wednesday May 11, 2016. When a group of young, black children set fire to a school bus outside a Jewish school this week, it evoked bad memories of a violent riot in the same Brooklyn neighborhood 25 years ago. Relations between blacks and Jews in Crown Heights have been peaceful for many years, but some community leaders say tensions remain.

NEW YORK — Twenty-five years after violent race riots in Brooklyn's Crown Heights neighborhood, a new incident — the torching a school bus outside a Jewish school — has raised questions about whether tensions are starting to fray again.

Police have arrested five black boys in this week's blaze.

Tensions between blacks and Jews in the neighborhood were thought to have largely eased since 1991, when the neighborhood's black residents exploded into days of rioting after a 7-year-old boy was accidentally struck and killed by a car in the motorcade of the leader of the Lubavitcher sect.

A rabbinical student was stabbed and died.