Darrell Harris, a high school student, died after an encounter with men who were having a water gun fight at a local park, an official with knowledge of the incident said.

Not since 2019 have so many New Yorkers in a single day sought emergency medical attention for heat-related illnesses.

Zohran Mamdani has promised to fight antisemitism, while consistently criticizing Israel’s treatment of Palestinians and its conduct of the war in Gaza.

Many Muslim Americans in New York City were impressed by Mr. Mamdani’s campaign and thrilled at being able to see themselves reflected in a mayoral candidate.