A Kenyan driver has been killed and four foreign aid workers kidnapped at a refugee camp in Kenya close to the border with Somalia.

The foreigners, from Canada, Norway, Pakistan and the Philippines, worked for the Norwegian Refugee Council.

They were travelling in a convoy when they were ambushed by gunmen in Dadaab, which houses more than 450,000 Somalis.

Several aid workers have been kidnapped from Dadaab in the last year and many groups have withdrawn from the camp.