A police constable was killed and four others injured on Monday when gunmen ambushed a law enforcement team heading to escort polio vaccinators in Hangu district (a volatile area in Khyber Pakhtunkhwa, northwestern Pakistan). The attack occurred on the opening day of a nationwide polio vaccination drive running from April 13–19, with local police reporting that two of the assailants were also killed in retaliatory fire. The incident underscores the persistent danger facing vaccination efforts in Pakistan, which — alongside Afghanistan — remains one of only two countries where polio is still endemic, with security threats, vaccine hesitancy, and misinformation continuing to hinder eradication campaigns.