The assault reportedly happened at 3:45 a.m. local time (23:15 GMT Sunday) upon the Central Reserve Police Force (CRPF) camp in Sumbal, 30 kilometers (19 miles) north of the Kashmiri city of Srinagar.
"Early this morning a group of heavily armed Fidayeen [suicide bomber] terrorists approached the CRPF's Sumbal camp with the intent of breaching the camp… However the CRPF, in cooperation with force from the adjoining J&K police camp shot dead all the 4 terrorists," the Home Office said on Twitter.
The Indian Home Office also stated that the "terrorists were heavily armed with automatic rifles, grenades and incendiary material such as petrol, and were carrying dry rations." That meant the militants intended to carry out a prolonged siege and cause extensive damage, the Home Office pointed out.
Kashmir has been disputed between India and Pakistan since partition of India in 1947. The two countries have gone through three wars over the region, but the conflict has not been resolved. The recent significant escalation is connected with the killing of Burhan Wani by Indian security forces in July 2016. Wani was the leader of a Kashmiri separatist group, outlawed in India.