The U.S. Geological Survey gave a preliminary magnitude of 5.7 and said the epicenter was about 7 miles (12 kilometers) west-northwest of the town of Nopalapan at a depth of 69 miles (111 kilometers).
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The quake triggered seismic alarms 235 miles (380 kilometers) away in Mexico City, but it was not felt in the capital. There were no immediate reports of damage.
Reporters covering a presidential news conference in Mexico City were seen scrambling when the seismic alarms went off.
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