Mexico was struck by a powerful earthquake on Monday that killed at least 149 people and toppled several buildings in the capital.
Rescue workers were digging through rubble throughout the night in a desperate search for survivors.
The 7.1 magnitude earthquake came on the anniversary of a devastating 1985 temblor that caused major damage to Mexico City, and struck as many people took part in an earthquake drill.
Mexico City’s buildings crumble as deadly 7.1 magnitude earthquake hits – in pictures
It also came less than two weeks after another major quake killed 90 people in the country’s south.
Thousands fled into the streets in panic as the powerful quake rocked several states in the centre of the country.
The epicentre was Atencingo in Puebla state, around 75 miles south-east of Mexico City, and struck at a depth of 32 miles, according to the US Geological Survey, at 1.14pm local time.
People trapped in rubble
Tony Gali, the governor of Puebla, said that church steeples had been toppled in the city of Cholula.
Mayor Miguel Angel Mancera said buildings fell at 44 places in Mexico City, where more than 50 people died, and fires broke out in several of them.
Interior Secretary Miguel Angel Osorio Chong said rescue teams were working painstakingly with picks and shovels to free people who had been trapped
“We have some buildings where we have reports that there could be people inside. They are doing it with lots of caution,” the interior secretary said, adding that more rescue personnel would be needed.
One video posted on social media showed a large industrial building swaying and then crumbling in a huge cloud of dust and rubble. Mexican TV showed cars crushed by debris.
Magnitude 7.1 Earthquake in Mexico
There was chaos in Mexico City, with traffic jammed to a standstill and ambulances trying to reach those injured.
Hundreds of civilians rushed to help search for people who may have been trapped.
Carlos Mendoza, 30, said that he and other volunteers in Mexico City had been able to pull two people alive from the ruins of a collapsed apartment building after three hours of effort.
“We saw this and came to help,” he said. “It’s ugly, very ugly.”
‘There was thunder…then dust’
Another volunteer rescue worker, Mariana Morales, said she saw a building collapsing in a cloud of dust before her eyes as she travelled in a taxi.
“There was the sound of thunder … then dust and all this,” she said. “The people are organising quickly.”