Explosions at the Fukushima Daiichi nuclear plant caused more serious disaster to Japan after a 9.0 magnitude earthquake and tsunami.
At least 10,000 people were killed in the earthquake and tsunami disasters.
This is the world’s most serious nuclear accident since the Chernobyl disaster in Ukraine in 1986.
Nuclear power plant is a place where people produce electricity.
But nuclear radiation is very, very dangerous.
It can kill human, animals and plants and it can also caused cancer.
It could cause a big disaster and the effect will last for a long, long time.
This is the worst nuclear disaster in Japan after the Hiroshima and Nagasaki bombings in 1945.