Investigation begins into Japanese chemical explosion

An investigation has began into an explosion at a chemical plant in Japan on Saturday which killed four people and injured twenty eight others.

The explosion happened at the Nisshim Chemical Company in Ojima, sixty two miles north of Tokyo.

Firefighters are sifting through the wreckage after a huge blaze.

Police they're also questioning the management of the plant, where there was a similar explosion two years ago.

From the newsroom of the BBC World Service