The frequent blasts have forced police to change their operational strategy to guard the city that houses the Raj Bhavan, CM's bungalow, secretariat, assembly, head offices of various government departments and official residences of VVIPs.
The controversial Armed Forces(Special Powers) Act has been lifted from Imphal municipal areas following intense public agitation since 2004.
The injured victims have been identified as Kishan Chakrabarty and Rajdeev Sharma (both students) of Serou village in Thoubal district, migrant workers Raghunath Madhap and Sambhu Shah from Bihar and A Arun, a local taxi driver.
The bomb, believed to have been planted beneath a hand cart belonging to migrant workers, went off in the morning.
The southern compound wall of Bheirodan Maxwell High School was damaged due to the impact of the blast.
