Restrictions were imposed in some parts of Srinagar city on Sunday to prevent separatist-called protests against Union Home Minister Rajnath Singh's visit to Jammu and Kashmir, police said.The minister is scheduled to address a gathering of police personnel and Central Reserve Police Force (CRPF) troopers at Khanabal in Anantnag district later in the day.Restrictions were imposed by the Srinagar District Magistrate in Maisuma, Safa Kadal, M.R. Gunj, Nowhatta, Khanyar and Rainawari, the police said.Senior separatist leaders, Syed Ali Geelani and Mirwaiz Umer Farooq were placed under house arrest while Muhammad Yasin Malik has been lodged in the city's Central Jail.Railway authorities also suspended train services between north Kashmir's Baramulla and Jammu's Bannihal towns.Heavy security was deployed in the areas under restriction.A day before the Home Minister's visit to Anantnag district, militants killed a police constable and injured two others in Anantnag town in a hit and run attack.Security forces killed one militant and arrested another terrorist on Saturday night following an attack on an army vehicle in Barbugh village of Shopian district.