Emergency authorities across the region urged people to stay home, and a utility company cut off power to 100,000 of its customers near Denver.

A Reddit user provided information that helped identify Claudio Manuel Neves Valente as the suspect not only in the campus shooting but also in the murder of an M.I.T. professor.

The shift would mean fewer shots recommended for children. But a Danish health official found the idea baffling, saying the United States was getting “crazier and crazier in public health.”

Lt. Gen. Francis L. Donovan, a Marine general with expansive experience in special operations and the Middle East, would take over after the abrupt departure of the previous commander.

Hundreds of people had rallied for the family in New York City after they were separated by Immigration and Customs Enforcement agents in November.

Mayor-elect Zohran Mamdani said he did not know about the antisemitic posts and would not have hired the woman who made them if he had.

The bill, which would ensure that every train has a conductor and a driver, as most now do, was supported by the transit workers’ union and opposed by many transit advocates.

Starting on Feb. 1, Rome will charge tourists a fee to go down into the basin of the famed 18th-century fountain. Not every one is happy (except Romans, who won’t have to pay).

At a demonstration of devices designed to replace turnstiles, one rider got hit in the neck, and another sneaked through without paying.

In a previously undisclosed partnership, the Transportation Security Administration and Immigration and Customs Enforcement are sharing data to identify passengers on upcoming flights whom ICE can arrest. Our reporter Hamed Aleaziz, who learned of this partnership, describes what to know about it and the ICE arrests that have followed.

Passengers on Metro-North and Long Island Rail Road trains could face $8 fines if they keep waiting until after the train leaves to activate their mobile tickets.

Our writers and photographers were on the ground to find out what makes the destinations on our annual list rise above the rest.

What’s the real cost of motherhood? Here’s what our readers said.