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| Workers dug through toppled buildings in Mexico City for a second night |
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.
At least 21 children and five adults died when the primary school collapsed and many others are missing.
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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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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.
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."