A massive rescue operation is taking place in China after the devastating earthquake which killed more than 12,000 people.
Troops have now arrived in the place where the quake struck - an area called the Sichuan province - but heavy rain is making it harder for them to help.
The whole country is in shock after the quake - which was the most powerful one to hit China for 30 years.
Thousands of people are also trapped in rubble after buildings collapsed.
A big part of the rescue operation is to save the children affected by the disaster. It's thought that many children are trapped under collapsed school buildings.
Arun Muttreja, from the charity Save the Children, said: "There are children who have been injured, some who've lost their lives, some who've lost their loved ones. We need to get their lives back to normal as soon as possible."
In some places 80% of buildings have been destroyed.
Landslides
Heavy rain is making things worse
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The head of the Chinese government, Wen Jiabao, has visited some of the towns already, and he urged the rescue teams to clear roads into the worst-hit areas as soon as possible so they can help more people.
Boulders and landslides are blocking roads and helicopters have been unable to land because of bad weather.
The quake hit near the city of Chengdu and reached 7.8 on the Richter scale, which measures tremors. The scale goes up to 10, so this was a big quake.
Tremors from Monday's earthquake were felt for miles around.
Workers in the Chinese capital, Beijing - about 930 miles from Chengdu - said buildings there shook for about two minutes.