7.1 magnitude earthquake rocks Mexico City

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.

Buildings swayed in Mexico City, where nerves are still raw from Tuesday’s magnitude 7.1 temblor that has killed at least 305 across the region. Many residents and visitors fled homes, hotels and businesses, some in tears.

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 — 167 — 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. (AP)

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7.1 magnitude earthquake rocks Mexico City

A woman prays after a tremor was felt in Mexico City, Mexico, Sept. 23, 2017. (Photo: Jose Luis Gonzalez/Reuters)

7.1 magnitude earthquake rocks Mexico City

People stay outdoors as new 6.4 earthquake hit Mexico City, Mexico, 23 Sept. 23, 2017. (Photo: Jorge Dan Lopez/EPA-EFE/REX/Shutterstock)

7.1 magnitude earthquake rocks Mexico City

Rescue workers embrace each other after a seismic alert sounded in Mexico City on Sept. 23, 2017, four days after the powerful quake that hit central Mexico. (Photo: Ronaldo Schemidt/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Family members who have been camped out for days nap under a tarp alongside the collapsed office building where they believe their relatives are trapped, in the Roma Norte neighborhood of Mexico City, just after midnight on Sept. 23, 2017, more than three days after a 7.1 magnitude earthquake toppled buildings. (Photo: Rebecca Blackwell/AP)

7.1 magnitude earthquake rocks Mexico City

A family sleeps on a square after being displaced from their home due to the risk of collapse, in the aftermath of a 7.1 earthquake, in Mexico City, Friday, Sept. 22, 2017. (Photo: Natacha Pisarenko/AP)

7.1 magnitude earthquake rocks Mexico City

Atrium of a church is seen inside debris of a destroyed building three days after the magnitude 7.1 earthquake jolted central Mexico killing more than 250 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 22, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Volunteers remove rubble from the Neto supermarket where people were found deceased in the San Gregorio Atlapulco neighborhood of Delegacion Xochimilco on Sept. 22, 2017 in Mexico City, Mexico. (Photo: Gary Coronado/Los Angeles Times via Getty Images)

7.1 magnitude earthquake rocks Mexico City

People of Jojutla walk three days after the magnitude 7.1 earthquake jolted central Mexico killing more than 250 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 22, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

A house is seen in Jojutla streets three days after the magnitude 7.1 earthquake jolted central Mexico killing more than 250 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 22, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescue workers are seen under heavy rain during the search for survivors in Mexico City on Sept. 22, 2017, three days after a strong quake hit central Mexico. (Photo: Ronaldo Schemidt/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescuers make the signal for silence during the search for survivors in a flattened building in Mexico City on Sept. 21, 2017, two days after a strong quake hit central Mexico killing at least 240 people. (Photo: Ronaldo Schemidt/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

a woman is seen reading letters in memoriam of dead children during the rescue of a person by the 7.1 magnitude earthquake occurred, at lest 273 people has confirmed dead on Sept. 21, 2017 in Mexico City, Mexico. (Photo: Carlos Tischler/NurPhoto via Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescue workers put on rain gear during the search for survivors and bodies in Mexico City on September 21, 2017, two days after a strong quake hit central Mexico. (Photo: Ronaldo Schemidt/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Search and rescue team members work to bring down a large piece of concrete during rescue efforts at the Enrique Rebsamen school in Mexico City, Mexico, Thursday, Sept. 21, 2017. (Photo: Anthony Vazquez/AP)

7.1 magnitude earthquake rocks Mexico City

Soldiers and volunteers knock down the walls of a damaged house in Joquicingo, Mexico on September 21, 2017. (Photo: Mario Vazquez/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescue operations continue on September 21, 2017 in Mexico City, Mexico. (Photo: Rafael S. Fabres/Getty Images)

7.1 magnitude earthquake rocks Mexico City

A woman hands out food to people after an earthquake, in Jojutla de Juarez, Mexico Sept. 21, 2017. (Photo: Edgard Garrido/Reuters)

7.1 magnitude earthquake rocks Mexico City

People accompany caskets, holding the bodies of victims who died in an earthquake, through the streets in Atzala, on the outskirts of Puebla, Mexico, Sept. 20, 2017. (Photo: Imelda Medina/Reuters)

7.1 magnitude earthquake rocks Mexico City

In this Sept. 20, 2017 photo, workers rescue a religious statue from the heavily damaged former convent of San Juan Bautista, in Tlayacapan, Morelos state, Mexico. People by the millions rushed from homes and offices across central Mexico, after a 7.1 earthquake, sometimes watching as buildings they had just fled fell behind them with an eruption of dust and debris. (Photo: Eduardo Verdugo/AP)

7.1 magnitude earthquake rocks Mexico City

A survivor is pulled out of the rubble from a flattened building in Mexico City on Sept. 20, 2017 as the search for survivors continues a day after a strong quake hit central Mexico. (Photo: Pedro Pardo/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescue workers search for the trapped citizens over the collapsed buildings after a powerful magnitude 7.1 earthquake that hit Mexico City, Mexico on Sept. 20, 2017. (Photo: Daniel Cardenas/Anadolu Agency/Getty Images)

7.1 magnitude earthquake rocks Mexico City

A woman cries on the phone as the search for survivors continues in Mexico City on Sept. 20, 2017 a day after a strong quake hit central Mexico. (Photo: Ronaldo Schemidt/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescuers remove rubble from a collapsed building a day after the magnitude 7.1 earthquake jolted central Mexico killing more than 200 hundred people, damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 20, 2017 in Mexico City, Mexico.(Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

People look for family and friends on a list of people rescued from an office building along Calle Alvaro Obregon in Colonia Condesa, in Mexico City, on Sept. 20, 2017. (Photo: Gary Coronado/Los Angeles Times via Getty Images)

7.1 magnitude earthquake rocks Mexico City

Aerial view of a flattened building in Mexico City taken on Sept. 20, 2017 as the search for survivors continues a day after a strong quake hit central Mexico.
(Photo: Mario Vazquez/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Soldiers remove debris of a collapsed building in the aftermath of powerful magnitude 7.1 earthquake that hit Mexico City, killing dozens and causing widespread panic in Mexico on Sept. 20, 2017. (Photo: Manuel Velasquez/Anadolu Agency/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescuers, firefighters, policemen, soldiers and volunteers search for survivors in a flattened building in Mexico City on Sept. 20, 2017 a day after a strong quake hit central Mexico. (Photo: Yuri Cortez/AFP/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescuers work after the magnitude 7.1 earthquake jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 19, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Alejandra Reynoso, left, and boyfriend Alejandro Gamez, wait for news on Gamez’s sister Karen Nayeli, 25, who is missing from a collapsed office building along Calle Alvaro Obregon, in Colonia Condesa, in Mexico City, on Sept. 20, 2017. (Photo: Gary Coronado/Los Angeles Times via Getty Images)

7.1 magnitude earthquake rocks Mexico City

Search and rescue continues for people in a collapsed six story residential building in Colonia Condesa, in Mexico City, on Sept. 20, 2017. (Photo: Gary Coronado/Los Angeles Times via Getty Images)

7.1 magnitude earthquake rocks Mexico City

Rescuers work after the magnitude 7.1 earthquake jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 19, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

Aerial view of collapsed buildings after the magnitude 7.1 earthquake that jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on Sept. 19, 2017 in Mexico City, Mexico. (Photo: Hector Vivas/Getty Images)

7.1 magnitude earthquake rocks Mexico City

A car sits crushed from a building felled by a 7.1 earthquake, in Jojutla, Morelos state, Mexico, Sept. 20, 2017. (Photo: Eduardo Verdugo/AP)

7.1 magnitude earthquake rocks Mexico City

A family attends a wake for a victim of a 7.1 earthquake, beneath a makeshift shelter in Jojutla, Morelos state, Mexico, Sept. 20, 2017. (Photo: Eduardo Verdugo/AP)

7.1 magnitude earthquake rocks Mexico City

Family members attend a wake for toddler Daniel Novoa and his aunt, Marta Cruz, fatal victims of a 7.1 earthquake, in Jojutla, Morelos state, Mexico, Sept. 20, 2017. (Photo: Eduardo Verdugo/AP)

7.1 magnitude earthquake rocks Mexico City

The Santiago Apostol church stands damaged after the 7.1 earthquake in the town of Atzala in Puebla state, Mexico, Sept. 20, 2017. (Photo: Pablo Spencer/AP)

7.1 magnitude earthquake rocks Mexico City

Volunteers and rescue workers search for children trapped inside the Enrique Rebsamen school, collapsed by a 7.1 earthquake in southern Mexico City, Sept. 20, 2017. (Photo: Miguel Tovar/AP)

7.1 magnitude earthquake rocks Mexico City

A man is rescued from a collapsed building in the Condesa neighborhood of Mexico City after an earthquake in Mexico, Sept. 19, 2017. (Photo: Pablo Ramos/AP)

7.1 magnitude earthquake rocks Mexico City

Volunteers and rescue workers search for children trapped inside the Enrique Rebsamen school, collapsed by a 7.1 earthquake in southern Mexico City, Sept. 20, 2017. (Photo: Miguel Tovar/AP)

7.1 magnitude earthquake rocks Mexico City

An injured man is pulled out of a building that collapsed during an earthquake in Mexico City, Sept. 19, 2017. (Photo: Rebecca Blackwell/AP)

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