Up to 20 U.N. staff killed in north Afghan city

(Reuters) - Afghan protesters angered by the burning of a Koran by an obscure U.S. pastor killed up to 20 U.N. staff, beheading two foreigners, Up to 20 U.N. staff killed in north Afghan city Reuters --- Afghanistan: United Nations mission rocked by mob killings The Guardian Telegraph - The Press Association - Atlanta Journal Constitution --- Video: 8 UN staff killed in Afghan Koran burning protest --- UN strongly condemns deadly attack against staff in Afghanistan