ROME (AP) — Pope Leo XIV on Sunday told more than a million Catholic youths at a closing Mass for a weeklong encounter with the next generation of faithful that they are “the sign that a different world is possible” where conflicts can be resolved with dialogue, not weapons.

Pope Leo XIV celebrated mass on Sunday with more than 1 million young Catholics from around the world, marking the biggest event for the pontiff since he was elected. NBC News’ Claudio Lavanga reports from Rome.