Six unidentified militants were gunned down by troops in two separate gun battles in Jammu and Kashmir's Kupwara district on Thursday, a defence spokesman said.Troops of counter-insurgency Rashtriya Rifles (RR) and special operations group (SOG) this morning launched a massive search operation in the forest area in Lolab in Kupwara district, he said."The operation was launched on specific information about presence of a group of heavily-armed militants in the forest area. While the troops were conducting searches, hiding militants opened fire leading to a fierce excahnge of fire. Three militants were killed and the operation is still on," the spokesman told IANS.He said army also gunned down three more militants in another gunbattle in the forest area near Drugmulla in the same district."This operation is also still on," he added.