DERA ISMAIL KHAN: Gunmen killed two policemen escorting a polio vaccination team in Gandi Umar Khan area here on Tuesday.According to officials, the policemen were going home on completion of duty with the vaccina-tion team when they were attacked. The victims, Ilyas and Idrees, were shot in the head.After the incident, security for polio vaccinators was beefed up in the town.

Last month two policemen were killed in attacks on polio vaccination teams in Parwa tehsil of Dera Ismail Khan.