Officials in North Texas will watch for potential threats from a new $40 million emergency operations center, one of many new security precautions in place across North America.

© Desiree Rios for The New York Times

With President Trump and Mayor Zohran Mamdani set to attend Monday night’s Knicks game at Madison Square Garden, there will be strict security in Midtown Manhattan.

© Vincent Alban for The New York Times