Updated at 11:10 p.m. ET
Thirty-two years to the day after an earthquake killed thousands of people in Mexico, a powerful quake rattled the country's central region Tuesday. Buildings shivered in Mexico City, and dozens collapsed, sending clouds of dust skyward.
Residents, who just hours before had taken part in large simulated-earthquake drills to mark the anniversary, emptied into the streets when the real quake struck.