A strong new earthquake shook Mexico on Saturday, toppling already damaged homes and a highway bridge and causing new alarm in a country reeling from two even more powerful quakes this month that together have killed nearly 400 people.
The U.S. Geological Survey said the new, magnitude 6.1 temblor was centered about 11 miles (18 kilometers) south-southeast of Matias Romero in the state of Oaxaca, which was the region most battered by a magnitude 8.1 quake on Sept. 7.
It was among thousands of aftershocks recorded in the wake of that earlier quake, which was the most powerful to hit Mexico in 32 years and killed at least 90 people.
There were some early reports of damage in Oaxaca. The Federal Police agency posted images online showing a collapsed bridge that it said had already been closed due to damage after the Sept. 7 quake.
Bettina Cruz, a resident of Juchitan, Oaxaca, said by phone with her voice still shaking that the new quake felt "horrible."
"Homes that were still standing just fell down," Cruz said. "It's hard. We are all in the streets."
Cruz belongs to a social collective and said that when the new shaking began, she was riding in a truck carrying supplies to victims of the earlier quake.
Nataniel Hernandez said by phone from Tonala, in the southern state of Chiapas, which was also hit hard by the earlier quake, that it was one of the strongest movements he has felt since then.
"Since Sept. 7 it has not stopped shaking," Hernandez.
U.S. Geological Survey geophysicist Paul Caruso said the new temblor was an aftershock of the 8.1 quake, and after a jolt of that size even buildings left standing can be more vulnerable.
"So a smaller earthquake can cause the damaged buildings to fail," Caruso said.
"At the moment the greatest damage has been to the Ixtaltepec bridge, which should be rebuilt, and structures with previous damage that collapsed," President Enrique Pena Nieto tweeted. He said health workers were patrolling Juchitan to provide help to anyone who needs it.
Buildings and street signs swayed and seismic alarms sounded in Mexico City, prompting people with fresh memories of Tuesday's magnitude 7.1 temblor that has killed at least 295 across the region to flee homes and hotels. Some were in tears.
Alejandra Castellanos was on the second floor of a hotel in a central neighborhood and ran down the stairs and outside with her husband.
"I was frightened because I thought, not again!" Castellanos said.
Mexico City Mayor Miguel Angel Mancera said there were no reports of significant new damage in the capital, and rescue efforts related to Tuesday's quake were continuing. He reported that two people died of apparent heart attacks during the new temblor.
At the site of an office building that collapsed Tuesday and where an around-the-clock search for survivors was still ongoing, rescuers briefly evacuated from atop the pile of rubble after the morning quake before returning to work.
As rescue operations stretched into Day 5, residents throughout the capital have 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.
Along a 60-foot stretch of a bike lane in Mexico City, families huddled under tarps and donated blankets, awaiting word of loved ones trapped in the four-story-high pile of rubble behind them.
"There are moments when you feel like you're breaking down," said Patricia Fernandez Romero, who was waiting Friday for word on the fate of her 27-year-old son. "And there are moments when you're a little calmer. ... They are all moments that you wouldn't wish on anyone."
Families have been sleeping in tents, accepting food and coffee from strangers, people have organized to present a united front to authorities, who they pressed ceaselessly for information.
They were told that water and food had been passed along to at least some of those trapped inside. On Friday morning, after hours of inactivity blamed on rain, rescuers were readying to re-enter the site, joined by teams from Japan and Israel. Fernandez said officials told them they knew where people were trapped on the fourth floor.
It's the moments between those bits of information that torment the families.
"It's that you get to a point when you're so tense, when they don't come out to give us information," she said. "It's so infuriating
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