A strong earthquake struck southern Mexico on Saturday morning, the third major earthquake to hit the country this month, according to the U.S. Geological Survey.

The magnitude 6.1 tremor struck 12 miles southeast of the town of Matias Romero just before 8 a.m., a town in the southern Mexican state of Oaxaca where a more powerful magnitude 8.1 earthquake hit on Sept. 7, leaving at least 90 people dead.

On Tuesday, a 7.1-magnitude earthquake struck the region, killing more than 295 and dealing extensive damage to the capital Mexico City.

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A geophysicist with the Survey told The Associated Press that the latest earthquake was an aftershock of the 8.1 tremor earlier this month. It was strong enough to activate seismic alarms in Mexico City, which is still recovering from Tuesday's event.

There have been no casualties or major damages from the latest earthquake, except a downed bridge and further damage to residences already damaged from the Sept. 7 event, The Los Angeles Times reports.

On Thursday, the U.S. sent an elite team of rescuers from the U.S. Agency for International Development and specially trained members of the Los Angeles County Fire Department to aid in the rescue efforts.