Cross-border infiltration in held Kashmir has been on a decline since 2004, but about 600 to 800 militants are active in the state as per the assessment of various security agencies, the army's Northern Command chief said on Thursday. "About 600 to 800 militants are active in Jammu and Kashmir as per the assessment of various security agencies," General Officer Commanding in chief (GOC-in-C), Northern Command, Lt-Gen P C Bhardwaj told reporters soon after conclusion of northern command investiture ceremony here on Thursday. "You have recently heard director general of police (J&K) there about a bandwidth of assessments by several agencies. The sum of all of them has come up to such a figure," he said. He maintained that militants and their leadership are under severe pressure due to the elimination of their top cadres. Due to this cumulative effect, 335 militants have been killed in joint operations during last year, he said. Referring to cross-border infiltration, Gen Bhardwaj said, "Infiltration is on decline since 2004 due to multi-tier deployment of security we have taken along LoC". To a question about militants being staged along the borderline for infiltration into J&K, he said, "We are concerned. We keep up vigil against infiltration which happens specially in winter months. Security in south of Pir Panchal has been beefed up as infiltration may take place there". He further said every month throughout the year and for so many years, they (militants) remain prepared to find any opportunity to infiltrate.