CHARSADDA     -   A policeman was martyred and another person injured in hand grenade attack here on Friday. According to details, culprits hurled hand grenade at policemen near Nasta police station in Charsadda. In hand grenade explosion, a cop identified as Rahim Bacha was martyred while another person was injured. The body and injured were shifted to District Headquarter (DHQ) Hospital and police after registering a case into the incident started an investigation.