Switzerland prepares for a national day of mourning, as authorities say many of those killed were teenagers and students—and prosecutors investigate possible negligence.

A militant group claimed responsibility for a winter arson attack on the city’s power network, leaving households without electricity for days and triggering warnings over public safety.

The U.S. president says American officials found no evidence of a Ukrainian strike on the Russian presidential residence.

Eight months into his time in office, Germany’s chancellor has ceded strategy, leverage, and initiative to others.