Cameron on hostage rescue: 'A brave operation'

Four aid workers, including one British woman, who were kidnapped in Afghanistan, have been freed in a helicopter operation by special forces.

Helen Johnston was among a group of four people who were taken hostage in the remote mountains of northeastern Afghanistan.

The kidnappers, who were all killed during the rescue operation, were armed with heavy machine guns, rocket propelled grenades and AK-47s.

The Prime Minister paid tribute to the bravery of the forces involved in the rescue operation.