Life across the Kashmir Valley was adversely affected on Wednesday due to the separatist called protest shutdown against the killing of three civilians in clashes with security forces.Authorities here and in all other district headquarters made sufficient deployment of police and paramilitary forces to maintain law and order."Adequate deployments of security forces have been made in law and order sensitive areas," a senior police official told IANS."No curfew has been imposed anywhere," the official said.Shops, public transport, other businesses and education institutions remained closed in Srinagar city and elsewhere in the valley although private vehicles movement could be seen on roads.Train services between north Kashmir's Baramulla town and the Jammu region's Bannihal town have been suspended.Kashmir University has postponed all exams scheduled for Wednesday.Three civilians were killed in firing in Durbugh village of Budgam district during clashes between protesters and security forces on Tuesday.The clash followed a gunfight raging between the security forces and a holed up militant in the village.