A strong earthquake shook Mexico on Saturday, causing new alarm in a country reeling from two still-more-powerful quakes this month that have killed nearly 400 people.
The US Geological Survey says the new temblor was centered about 12 miles (19 kilometers) southeast of Matias Romero in the state of Oaxaca, which was the region most battered by a magnitude 8.1 quake on September 7.
