Some unidentified persons hurled two Hand grenades at the building of Excise Department that partially damaged the building however no casualty has been reported in the incident According to details some unidentified motorcyclists hurled two hand grenades at the building of Excise department on Siryab road here on Monday among. One of the hand grenade exploded with a huge bang that partially damaged the boundary wall of Excise office, however no casualty or injury has been reported in the incident. Law enforcement agencies reaching on the scene immediately cordoned off the area and called bomb disposal squad to diffuse the second unexploded hand grenade and initiated preliminary investigations over the incident.