A magnitude 6.2 earthquake has shaken southern Mexico and has rattled the capital, where seismic alarms sounded, residents ran into the streets and rescuers briefly stopped combing the rubble left by a bigger tremor earlier this week.
The United States Geological Survey said the new quake on Saturday was relatively shallow and hit near Juchitan, which is a tropical region of Oaxaca state hard hit by another major earthquake on September 7.
Already shaken by the two recent earthquakes that have killed at least 380 people in Mexico this month, thousands of people ran out onto the streets again in Oaxaca and Mexico City, some in pyjamas when the new tremor hit on Saturday morning.
"I heard the alarm and ran downstairs with my family," said Sergio Cedillo, 49, who was watching rescuers efforts to find survivors from Tuesday's quake when the alarm sounded.
No new damage was immediately reported, but rescue efforts were suspended in areas affected by Tuesday's quake to allow authorities to see if the new tremors would put workers at risk, Luis Felipe Puente, the head of Mexico's civil protection agency said.