In Manipur, campaigning for the state assembly elections has gained momentum with the filing of nomination papers by the political leaders of various parties. Senior Congress leader and Chief Minister Okram Ibobi Singh filed his nomination paper today at Thoubal.Manipur People’s Party President Dr. Nimaichand Luwang also filed his nomination paper today at Thoubal.Meanwhile, security has been beefed up across the state in view of the militant threat to Congress Party and its nominees.