DERA ISMAIL KHAN (APP) - One person sustained injuries when miscreants threw a hand grenade on police mobile van on DI Khan-DG Khan Road here on Tuesday, district police said. Two alleged attackers were arrested by police after the failed attempt in the limits of Parwa police station. The mobile party of Parwa police station was on routine patrolling when miscreants hurdled a hand grenade on the van. The policemen following narrow escaping started firing at outlaws and arrested two alleged attackers on the spot. One passerby person got wounded. Police have started investigation.