Rescuers are racing against the clock to reach survivors trapped under the rubble of a school in Mexico City which collapsed during Tuesday’s earthquake.
One of them, a 13-year-old girl, is believed to be sheltering under a table, officials told the BBC.
At least 21 children and five adults died when the primary school collapsed and many others are missing.
The school was one of dozens of buildings toppled by the quake. So far 230 people are known to have died.
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Mexico quake: Where buildings collapsed
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The race to help after the quake
President Enrique Peña Nieto has declared three days of mourning for the victims.
As rescue operations continued for a second night, attention was focused on the Enrique Rébsamen primary school, in Mexico City’s southern Coapa district.
Media captionMoments after the earthquake hit
With anxious parents gathered outside awaiting news of missing children, civil protection volunteer Enrique Gardia announced that a thermal scanner had detected survivors trapped between slabs of concrete.
“They are alive! Alive!” he shouted.
“Someone hit a wall several times in one place, and in another there was a response to light signals with a lamp,” he added.
One mother, standing nearby waiting for news of her seven-year-old daughter, told reporters: “No-one can possibly imagine the pain I’m in right now.”
On Wednesday, a trapped girl was detected after she moved her hand amid the debris. Details of the child and her condition have not been given but rescuers have passed food and water down to her.
Waiting crowds were frequently hushed as workers listened for sounds of life under the rubble.
More than 500 members of the army and navy together with 200 police officers and volunteers have been working at the site.
Mexico City authorities kept hopes alive on Wednesday, saying 52 people had been rescued so far from collapsed buildings.
Image captionThousands of volunteers have turned out to support search and rescue operations
Mayor Miguel Angel Mancera said 39 buildings in the capital had crumbled and search teams were scouring nearly all of them for survivors.
President Peña Nieto, visiting the damaged city of Jojutla in Morelos state, appealed for citizens to help rescue operations.
“It is important for people to be part of this group effort,” he said.
Most of the victims of the 7.1 magnitude earthquake died in the capital, according to government figures:
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Mexico City: 100 dead
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Morelos state: 69 dead
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Puebla state: 43 dead
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Mexico state: 13 dead
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Guerrero: Four dead
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Oaxaca: One dead


