Kh Mangi, vice-president of Khwairamband Keithel Saktam Kanba Lup, also demanded that the Centre remove NSCN(IM) from Manipur immediately, failing which it would intensify the agitation.
Three policemen were killed and 14 others injured in ambush at two places as the United Naga Council (UNC) was gearing up for a mass rally in four Naga dominated districts of the state in protest against creation of the seven districts in the state by the O Ibobi Singh-led government.
They shouted slogans, displayed placards against NSCN (IM) for their alleged involvement in yesterday's attacks.