imphal suspected militants triggered a grenade blast in the uripok area of imphal city on sunday morning though the shutters and walls of some shops were damaged by splinters no one was injured though the motive behind the blast could not be ascertained many believe it might be linked to monetary demand slapped on businessmen by rebels security has been beefed up following the incident the incident comes nine days after a powerful ied went off at thangal bazaar in imphal citymanipur has witnessed bomb and gun attacks by militants on the residence of ministers mlas businessmen officials and government contractors mostly in connection with monetary demandsno group has claimed responsibility for sundays explosion till the time of filing this report