Thousands of people have been killed and many more injured as a massive earthquake hit China on Monday.
Hundreds of students were in Juyuan Middle School in Dujiangyan city, near where the earthquake struck, when the building collapsed.
It's thought many others may also have been buried in the rubble of collapsed houses, schools and factories in a region called Sichuan in the south west of China.
Workers who were told to leave their buildings in time have been trying to get in touch with their friends and family to find out what's going on.
Photographers have been able to get pictures of the devastation caused by the quake in cities like Dujiangyan, but it's not clear how bad the damage is in more remote areas.
The quake shook buildings as far away as Beijing, Shanghai and the capital of Thailand, called Bangkok.
This building in Lanzhou started to crack up during the quake, even though it's hundreds of kilometres away from the quake's epicentre.