Islamabad - The UN children's agency (Unicef) and the World Health Organisation (WHO) suspended work on campaigns against polio in Pakistan on Wednesday after a series of attacks left nine health workers dead in three days. Unicef spokesperson Michael Coleman told AFP the two organisations halted polio work in Sindh and Khyber Pakhtunkhwa provinces on Tuesday after attacks inKarachi and Peshawar, but extended the suspension nationwide after fresh bloodshed on Wednesday. The Taliban is opposed to the campaign, saying it is a cover for espionage.