A group of UK aid agencies has launched a joint fundraising appeal to help more than 10 million people affected by severe drought in the Horn of Africa.

Thousands of families in desperate need of food and water have trekked for days from Somalia to the Dadaab refugee camp in eastern Kenya.

The drought is the worst in East Africa for 60 years and the UN described it as a "humanitarian emergency".

The Disasters Emergency Committee (DEC) appeal will be broadcast by the BBC.

Ben Brown reports from Dadaab.