A strong new earthquake has shaken Mexico, causing alarm in a country reeling from two powerful quakes this month that together have killed nearly 400 people.
The United States Geological Survey said the magnitude-6.2 quake on Saturday was relatively shallow and hit near Juchitan, which is a tropical region of Oaxaca, a state hard hit by a magnitude-8.1 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 shortly before 8:00am (local time).
No new damage was immediately reported, but rescue operations in the rubble of buildings downed by a magnitude-7.1 quake that struck central Mexico were temporarily suspended.
"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.
This week's quake killed at least 295 people and collapsed buildings in Mexico City.
As rescue operations stretched into their fifth day, residents throughout the city held out hope that dozens still missing might be found alive.
More than half the dead — 157 — perished in the capital, while another 73 died in the state of Morelos, 45 in Puebla, 13 in Mexico State, six in Guerrero and one in Oaxaca.