Four people were killed by militants in separate incidents in Rajouri and Udhampur districts of J-K, sources said on Saturday. Militants abducted one Gulzar Ahmed and his son from Maujor village of Rajouri on Friday night and their bodies were found this morning from a nearby forest. The ultras had earlier killed one Zaheed Mehmood in the same village and Qasim Ali in Udhampur.Meanwhile, 28 persons, mostly civilians, were injured on Saturday when militants hurled a grenade at an Army patrol in Shopian town of Pulwama, sources said.