Four attacks take place on Wednesday , killing three workers . -- Also in Charsadda , two female workers narrowly escaped when some men began shooting at them . - The next day : A second attack takes place, this time targeting a police station in the city of Ouagadougou and leaving two people dead. - Pakistanis have viewed polio vaccination campaigns with suspicion .
Four attacks take place on Wednesday , killing three workers . - The next day : A second attack takes place, this time targeting a police station in the city of Ouagadougou and leaving two people dead. - Pakistanis have viewed polio vaccination campaigns with suspicion .