A delegation of opposition MPs described the situation in strife-torn Manipur is "very serious" and accused the Centre of not taking strong enough steps to stem the violence in the northeastern state.The delegation of 21 MPs, representing the newly-formed opposition bloc INDIA, were in Manipur for a two-day visit to assess the ground situation.After returning from the violence-hit areas, Congress leader Adhir Ranjan Chowdhury alleged that "uncertainty and fear" are looming large in Manipur.