The Mexican government has issued advice on what to do if a quake strikes.

The tweet urges people to:

• stay calm
• find the evacuation route and meeting point
• stay away from windows and objects that may fall
• in case of emergency call 911
• do not use lifts

Image source, Getty Images

As soldiers joined the rescue teams to work throughout the night in the search for survivors at the Enrique Rébsamen elementary school, families watched on at the floodlit site.

Adriana D'Fargo, whose seven-year-old child attended the school, was desperate to hear news of her daughter, Reuters news agency reports.

"They keep pulling kids out, but we know nothing of my daughter," she said.

Three survivors were found at about midnight.

One soldier at the scene in the Coapa district was heard calling out: "Relatives of Fatima Navarro, Fatima is alive!"

Mexico's National Civil Protection System, external has mapped the damage caused by the 7.1 magnitude quake in Mexico City.

The Roma Norte area appears particularly badly hit.

Image source, Mexico's National Protection System

Mexico's Red Cross says it is supplying 39 ambulances, seven "urban rescue" vehicles and 217 paramedics to help support rescue work across Mexico City.

The group is also asking people to donate equipment such as shovels and lamps.

Financial journalist Vanessa Buendia describes the moment the quake struck.

"I was in the shower when it happened, when I heard my roommate shout at the top of her lungs: 'Earthquake!'

"I grabbed a towel and what I could and we ran out.

"Then I realised I didn’t have my phone so I ran back in to get it because I wanted to reach my parents.

"I could hear the ceiling cracking, things were smashing around me and furniture was toppling over.

"The scariest part was looking at the floor, it was literally jumping up and down."

Image source, Getty Images

President Enrique Peña Nieto says there are still 38 people missing in the Enrique Rébsamen elementary school which collapsed in Coapa, south-east of the capital, Mexico City.

Thirty of those missing are children.

Twenty-six children and four adults died when the four-storey building toppled.

Image source, EPA

Image source, AFP

France's former President Francois Hollande has expressed his solidarity with the people of Mexico.

"Terrible tragedy in Mexico, 32 years after the deadly earthquake in 1985," he tweeted.

Luis Felipe Puente, Mexico's National Co-ordinator for Civil Protection, has revised the death toll.

He is now reporting that 216 people have been confirmed killed after reducing the death toll in Mexico City to 86 and the state of Morales to 71.

Mexico's Secretariat of Public Education (SEP) is reporting that 209 schools have been affected by the quake, 15 of which have suffered severe damage.

The SEP also tweeted an image showing a long human chain in the streets of Mexico City clearing debris and volunteers delivering emergency supplies.

The tweet reads in Spanish: "Help us to identify the structural damages to the buildings in the following images."

In central Mexico, the army has been deployed to help the rescue effort, which has been continuing through the night.

Medical workers have also set up makeshift hospitals in the streets.

Image source, Reuters

Image source, Getty Images

Residents of Mexico City describe being forced to run for safety as buildings were reduced to clouds of dust.

One eyewitness, Jennifer Swaddle, says the experience was both "frightening" and "surreal".

"Nothing prepares you," she says.

Mexico's National Co-ordinator for Civil Protection, Luis Felipe Puente, has given a breakdown of the death toll: 117 have been killed in Mexico City.

The second worst hit is the state of Morelos with 72, followed by 43 in Puebla, 12 in the state of Mexico, three in Guerrero state and one in Oaxaca.

Footage posted on Twitter by daily newspaper Diario Récord shows the moment a golden retriever is rescued from a crushed building in Mexico City. Eighteen people have also been pulled alive from the building in the Roma Norte area of the city.

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Drone footage showing aerial shots of the quake's destruction are appearing on social media.

Images shared by ABC News show buildings in the capital, Mexico City, completely destroyed.

Witnesses have been describing the moment the earthquake struck in Mexico City.

Residents in several areas have reported smelling gas with the roofs of building in flames.

One witness, Jesus Chairez, said that people were running into the streets to avoid being buried as buildings toppled over.

"As I got to the middle of the street and looked back you could see the tall buildings swaying back and forth and there was a lot of powder coming up from between the buildings," he said.

"In fact, the whole street was like a big cloud of just dust."

At least 226 people are now believed have been killed in the quake in central Mexico, according to the nation's civil protection agency.

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Mr Peña Nieto also urged residents whose properties were structurally sound to remain in their homes where possible.

He said that this would allow the emergency services and those helping with rescue efforts in the streets.

Dozen of volunteers could be seen using buckets to help clear debris.

Mr Peña Nieto added that 60% of Mexico state and 40% of Mexico City was without electricity.

Image source, Reuters

President Enrique Pena Nieto has addressed the nation in a televised address.

"We are facing an emergency in Mexico City, in the states of Puebla and Morelos following this 7.1-magnitude earthquake," he said.

"There are medical centres available and public hospitals are opening up their services to everyone regardless of whether they are eligible for attention or not."

He added: "We may still find people under the rubble. Stay in touch, follow lines of communication, we will keep people updated."

At least 20 children, and a number of adults, were killed in the collapse of Enrique Rebsamen primary school in Mexico City, officials tell local media.