A powerful 6.2 magnitude earthquake has hit Mexico City, a Mexican monitoring body has said, and there are reports from witnesses of buildings shaking.

It wasn’t immediately clear if the trembler, which was centred in the southern state of Oaxaca, had caused any damages or injury. The United States Geological Survey said that the earthquake was an aftershock from a previous quake, and that already vulnerable buildings could be in danger of collapse from previous damage.

“I was frightened because I thought, not again!” Alejandra Castellanos, who was on the second floor in a central neighbourhood of the city, told the Associated Press. Ms Castellanos ran down the stairs and to the street with her husband as soon as she felt the earthquake.

Thousands of others reportedly also ran to the streets, fearing the worst after previous earthquakes left the country in fear of more damage.

In recovery areas, workers were forced to leave the rubble mounds they were sifting through, but were able to return to work shortly. Street signs reportedly swayed from the quake’s impact.

The earthquake comes just days after a 7.1 magnitude quake hit Mexico City, destroying buildings, and killing nearly 300 people. Response operations related to that event were still ongoing at the time of the new trembler.

The quake hit in a region of Mexico that was most shaken by an 8.1 magnitude earthquake that hit earlier this month as well. That earthquake struck off the coast of Mexico, and could be felt hundreds of miles away from its epicenter in Mexico City. That earthquake also left more than 60 people dead.

Mexico City earthquake in pictures Show all 13 1 /13 Mexico City earthquake in pictures Mexico City earthquake in pictures A handout picture provided by the citizen Edgar Cabalceta shows a general view of Mexico City following a magnitude 7.1 earthquake, in Mexico City, Mexico EPA Mexico City earthquake in pictures Rescuers and residents look for victims amid the ruins of a building knocked down by a magnitude 7.1 earthquake that jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on September 19, 2017 in Mexico City, Mexico. The earthquake comes 32 years after a magnitude-8.0 earthquake hit on September 19, 1985 Getty Images Mexico City earthquake in pictures A police officer stands guard near a building which collapsed after a quake rattled Mexico City RONALDO SCHEMIDT/AFP/Getty Images Mexico City earthquake in pictures Rescuers, firefighters, policemen, soldiers and volunteers remove rubble and debris from a flattened building in search of survivors after a powerful quake in Mexico City AFP/Getty Images Mexico City earthquake in pictures Rescuers and residents look for victims amid the ruins of a building knocked down by a magnitude 7.1 earthquake that jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on September 19, 2017 in Mexico City Getty Images Mexico City earthquake in pictures People try to rescue survivors from a collapsed buildings after a magnitude 7.1 earthquake on the Richter scale in Mexico City, Mexico, 19 September 2017. At least 79 people lost their lives in the states of Morelos, Puebla and Mexico by the earthquake of magnitude 7.1 on the Richter scale. EPA Mexico City earthquake in pictures People clear rubble after an earthquake hit Mexico City, Mexico REUTERS Mexico City earthquake in pictures People clear rubble after an earthquake hit Mexico City, Mexico REUTERS Mexico City earthquake in pictures Rescuers and residents assists an injured victim amid the ruins of a building knocked down by a magnitude 7.1 earthquake that jolted central Mexico damaging buildings, knocking out power and causing alarm throughout the capital on September 19, 2017 in Mexico City, Mexico. The earthquake comes 32 years after a magnitude-8.0 earthquake hit on September 19, 1985. Getty Images Mexico City earthquake in pictures People remove debris outside a collapsed building after an earthquake in Mexico City, Mexico REUTERS Mexico City earthquake in pictures People remove debris as they search for possible victims after a quake rattled Mexico City on September 19, 2017. A powerful earthquake shook Mexico City on Tuesday, causing panic among the megalopolis' 20 million inhabitants on the 32nd anniversary of a devastating 1985 quake. The US Geological Survey put the quake's magnitude at 7.1 while Mexico's Seismological Institute said it measured 6.8 on its scale. The institute said the quake's epicenter was seven kilometers west of Chiautla de Tapia, in the neighboring state of Puebla. AFP/Getty Images Mexico City earthquake in pictures A security guard walks over debris of a building which collapsed during a quake in Mexico City AFP/Getty Mexico City earthquake in pictures Reconstruction work in the towns affected by the telic movement has begun. Several temples suffered severe damage. Rex

In areas hit hardest by that earthquake, tremblers have been felt repeatedly since. The 6.2 magnitude quake Saturday was the most violent felt in Tonalá, one of the worst hit cities, according to a resident.