The World Health Organisation and UNICEF have suspended a polio vaccination campaign throughout the whole of Pakistan, after two more workers were shot dead and a third was wounded.
Eight health workers have now died since Monday, most of them in Karachi.
The campaign has been opposed by extremists, including Taliban militants.
Rukhsana Bi Bi’s daughter was among those killed. “(The attackers say) this (vaccination campaign) was planned by the Americans trying to kill our nation. (They say) the Taliban are in charge here, and this is a no-go area.”
Karachi resident Farooq Akhter said: “The people attacking the polio team workers have not been properly informed. They don;t know about the polio campaign and its benefits for children and future generations. Because whoever gets polio will be disabled for life.”
Pakistan’s minister overseeing the campaign said they did not expect such attacks in Karachi.
He said in more remote areas of the country where the threats are more pronounced, the government has been providing security for the vaccination teams.