The bomb, which did not cause any casualty, went off at 6:25 am at Moidangpok area where security and paramilitary personnel frequently passed while going to their camps at Langjing, about 20 km west of here, the sources said.
No individual or group claimed responsibility for the blast.
Over 20 bombs have been set off by insurgents in different parts of Manipur in the past two months.
