The country of North Korea in Asia is preparing to launch a rocket into space, and the news has got their neighbouring countries very worried.
North Korea says that the rocket launch is to put a satellite into orbit.
But other countries think they're actually testing a missile that could be used to carry nuclear weapons.
North Korea is one of the most secretive countries in the world and it's really difficult for outsiders to find out what's going on there.
They've started putting fuel into the rocket, which is due to blast off between 12 and 16 April.
North Korea says that the launch is part of the country's celebration to mark the 100th anniversary of the birth of the country's first leader Kim Il-sung.
America, China and Russia are among the countries who have told North Korea not go ahead with the launch.
Japan and South Korea say they will shoot the rocket down if it looks like it's threatening them.
Why are other countries worried about North Korea?
For years there have been concerns about whether North Korea is developing nuclear weapons.
The rocket being launched is very similar to one that could carry a nuclear warhead in the future.
North Korea was founded after the Second World War. It fought a war with its neighbour country South Korea for three years ending in 1953, and tensions between the two countries have been really high ever since.
Though it often has big military parades to make it seem powerful, North Korea is actually one of the world's poorest countries.
Charities reckon that two million people have died there since the 1990s because of a food shortage. The country relies on aid agencies to feed millions of its population.
People have to ask permission to travel around, and things like TV and what people can see on the internet are strictly controlled by the government.