A strong earthquake jolted Mexico on Thursday, sending people rushing out into the streets of the capital in the middle of the night, days after a powerful tremor left at least two people dead.
The epicenter of the 6.9-magnitude quake was near the Pacific coast, 84 kilometers (52 miles) south of Coalcoman in the western state of Michoacan, the national seismological agency reported.
The US Geological Survey (USGS) estimated the magnitude at 6.8.
Michoacan had been hit by a powerful magnitude 7.7 earthquake on Monday that damaged several thousand buildings and sparked panic more than 400 kilometers away in Mexico City.
The latest quake again triggered early warning alarms in the capital at 1:16 am (0616 GMT) and caused buildings to shake and sway.
Many people quickly evacuated their homes when the alarms sounded, some still dressed in pajamas and carrying their pet dogs.
"We had a 6.9 magnitude aftershock with an epicenter in Coalcoman," President Andres Manuel Lopez Obrador said on Twitter.
Mexico City Mayor Claudia Sheinbaum said official helicopters had flown over the city and that there were no initial reports of destruction.
"So far there is no damage in the city after the earthquake," she tweeted.
The quake hit at a depth of 12 kilometers, according to the national seismological agency, while USGS estimated the depth at 24 kilometers, located about 410 kilometers from Mexico City.
- Traumatic anniversary -
Monday's tremor came less than an hour after millions of people in Mexico City participated in emergency drills on the anniversary of two deadly earthquakes in 1985 and 2017.
The timing of Monday's tremor was no more than a coincidence, the national seismological agency said.
"There is no scientific reason to explain it," it added.
On September 19, 1985, an 8.1-magnitude quake killed more than 10,000 people and destroyed hundreds of buildings.
During Monday's earthquake, a man was killed by falling debris in a shopping center in Manzanillo in the western state of Colima.
A woman later died of injuries caused by a falling wall in the same city.
Mexico sits in the world's most seismically and volcanically active zone, known as the Ring of Fire, where the Pacific plate meets surrounding tectonic plates.
Mexico City, which together with surrounding urban areas is home to more than 20 million people, is built in a natural basin filled with the sediment of a former lake, making it particularly vulnerable to earthquakes.
The capital has an early warning alarm system using seismic monitors that aims to give residents enough time to evacuate buildings when earthquakes hit seismic zones near the Pacific Coast
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© Agence France-Presse
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