An explosion killed four policemen in a closed market at north Kashmir's Sopore town on Saturday morning, triggering worries that militants were back to using the bomb after a three-year break.
So far no militant group has claimed the responsibility for the attack.
Militants had planted the IED near a shop in a lane between the "Chotta Bazaar" and "Bada Bazaar" in Sopore. Authorities had deployed a large number of forces in the market and other areas of Sopore in the wake of the protest shutdown. The area has been cordoned off and a search operation is underway. "My deepest condolences to their families", Mehbooba tweeted. Three among the slain were identified as ASI Irshad Ahmad from Doda, Muhammad Amin from Kupwara and Ghulam Nabi and Ghulam Rasool - both residents of Sopore. They had asked people to give decent burial to the ultra. Six or seven shops have suffered damage as well", he said, adding "it was the first (IED) blast since 2015. "May the four fearless J&K police personnel killed in the line of duty today rest in peace", Abdullah tweeted.
The strike was called by separatist leaders who challenge India's sovereignty over Kashmir.
Former Chief Minister Omar Abdullah also expressed sorrow over the deaths.
Additional Director General of Police (ADGP), Kashmir Zone, Munir Ahmad Khan, said, "We have to think about it (IED)".
The two injured were shifted to hospital in Srinagar, said the police official.