Sources said the bomb, made of improvised explosive device (IED), was placed at a roadside in Chairen area when it went off at 10.30 am.
The road is was frequently used by security personnel including those from paramilitary forces to travel between Imphal and their camps at places near Chairen.
Police said the explosion occurred seconds after the security convoy (battalion or unit not yet known) passed through the area.
A farmer from a nearby locality who was going to his paddy field was injured by the splinters, sources said, adding that he was taken to a nearby hospital where his condition was stated to be out of danger.
Places like Manipur jail at Sajiwa, some Manipur Rifles battalion and several para-military posts are just a few kilometres away from Chairen area where the explosion occurred,
sources said.
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The area was immediately cordoned off.
It was also not yet known whether the bomb was remote controlled or had a timer attached to it, sources said.
Several bomb explosions targeting security and police personnel have been reported in the past few months from different parts of the state.