World leaders meet in Washington to discuss nuclear terrorism

World leaders will gather in Washington to discuss how to prevent terrorists getting hold of radioactive material, with the UK set to play a leading role in protecting nuclear facilities from cyber attack.

The UK and US will take part in a joint exercise next year to prepare for any online attack against nuclear power plants and waste storage facilities.

David Cameron will also offer British expertise to other countries to safeguard their own civil nuclear installations amid fears Islamic State jihadists could attempt to create a dirty bomb.