Workers of an anti-polio drive shout slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of their colleagues in Karachi

 
Workers of an anti-polio drive shout slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of their colleagues in Karachi
Workers of an anti-polio drive shout slogans during a protest rally organized by the Vaccinators Welfare Association against the killing of their colleagues in Karachi December 19, 2012. REUTERS/Akhtar Soomro