Lori Hinnant

An attacker armed with a knife killed three people inside a church Thursday in the Mediterranean city of Nice.

World leaders marked the end of World War I’s slaughter 100 years ago at commemorations that drove home the message “never again” but also exposed the globe’s new political fault lines.

French police raided 168 locations across the country and detained nearly two dozen people as authorities identified more members of a sleeper cell said to be behind the Paris attacks that killed 129 people.