NY Times: By DECLAN WALSH
The shootings followed a day of violence on Tuesday in the port city of Karachi in which four female health workers were killed. The attacks Wednesday brought the death toll from the three-day polio immunization campaign to eight people, most of them women.
The World Health Organization and Unicef ordered their staff members off the streets in response to the latest shootings, although some provincial governments continued to immunize children.
The shootings represent the most direct assault yet on an urgently needed public health program in one of the world’s last remaining reservoirs of the polio virus.