UPDATE: At least 15 dead as magnitude 8.2 quake rocks Mexico

MEXICO CITY: A powerful 8.2-magnitude earthquake rocked Mexico late Thursday, killing at least 15 people and triggering a tsunami alert in what the president called the quake-prone country's biggest one in a century.

Officials evacuated residents along the central and southern Pacific coast as seismologists warned a tsunami of more than three meters (10 feet) could be headed toward land, affecting coastal towns as far south as Ecuador.