Thousands of children have been caught up in the earthquake and tsunami in Japan.
Rescue teams and charities are heading from all around the world to help. Newsround spoke to Casey Calamusa from World Vision, who is out there, to find out what's being done.
How bad is it for the children there?
It's really bad at the moment. It's freezing in Japan and children who have lost their homes are having to survive without shelter or warm clothing. Many are having to sleep on cardboard boxes.
What's the most important thing being done to help?
It's really important to get them food, water and shelter. Because of the cold, we're trying to distribute clothes and blankets too.
Where can children go to stay safe?
We've been setting up child-friendly spaces, which are safe places for children to go and play. We've organised art and music projects, and children can come and talk to experts about their experiences. Lots of schools have been knocked down, so we need to give them somewhere to go and things to do.
How hard is it to get help to those who need it most?
Very difficult - many towns have been totally cut off. Roads have been wiped out and trees uprooted blocking routes to reach the victims of the quake.
Was Japan prepared for the earthquake?
Japan is very prepared for earthquakes. Buildings are built to withstand shaking and children practise what to do when earthquakes strike. If it hadn't been for all these measures, things could have been a lot worse.