UN staff killed during protest in northern Afghanistan
1 April 2011 Last updated at 19:55 BST
At least eight foreign UN workers and four others have been killed in an attack on a UN compound in the Afghan city of Mazar-e Sharif, officials say.
The violence happened during a protest over the burning of the Koran in a US church last month.
Witnesses said hundreds of people were protesting peacefully in the city when the scene suddenly turned violent.
Paul Wood reports.