One of the most stomach-churning scenes described by various news agencies was at a primary school on Mexico City's south side, where three floors collapsed into one, trapping students and teachers inside.
The magnitude 7.1 quake hit Tuesday and killed at least 225 people, almost half of them in the capital, 32 years to the day after the devastating 1985 quake.
The quake comes on the 32nd anniversary of a 1985 quake which killed 5,000 people and caused serious damage to the Greater Mexico City area.
President Enrique Peña Nieto said more than 20 children had died and 30 were missing after a school collapsed.
"The priority at this moment is to keep rescuing people who are still trapped and to give medical attention to the injured people", he said late Tuesday.
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Residents of Mexico City, a conurbation of some 20 million people, slept in the streets last night and 40% of homes were without power, said Reuters. This is about 100 miles away, which means approximately 160 kilometers from Mexico city. On September 19, 1985, a tremor spread terror and chaos throughout Mexico City, killing more than 10,000 victims.
The powerful 8.1 quake from earlier this month - the strongest to hit the country in 8 decades - left almost 100 people dead.
In Cuernavaca, a city in Morelos that is a popular destination for weekend visitors from Mexico City, there were reports on local radio of people trapped beneath collapsed buildings.
Another natural disaster struck Mexico on Tuesday afternoon with a 7.1 magnitude at a depth of approximately 50 kilometers.
He added that he saw a woman fainting as 'people started to run'. Officials report that 44 buildings collapsed, including a school and a few apartments. "We are with you and will be there for you", the president wrote on Twitter.
Tuesday's event was closer to more populated areas and in Mexico City it impacted an urban centre, which sits on the types of loose soils that make the shaking worse.
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