They said suspected insurgents ambushed an official team, including the superintending engineer and Manipur Rifles personnel of 8th Battalion escorting them by exploding two bombs and opening fire at a place between Khudengtabi and Kwatha Lamkhai, about 110 km south-east of here, at around 7.45 am.
A jawan, identified as Sushil Singh, was killed on the spot and ten persons - six Manipur Rifles personnel and four civilians including the engineer - were injured by bomb splinters, sources said, adding the team was returning to Imphal from the border town of Moreh after inspecting the condition of some roads in the area.
All the injured were taken to a hospital in Imphal, they said, adding the condition of some of them was stated to be serious.
Four hours later, suspected insurgents also exploded a powerful bomb attached to a vehicle at the roadside at Sekmai area in Imphal West district injuring three CRPF personnel and four civilians, sources said, adding that condition of the injured was not stated to be serious.
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No individual or group has claimed responsibility though the spots where the explosions took place were the operating zone of insurgents of different groups.
Official sources said all security and police posts have been put on alert and instructed to check movement of insurgents under their jurisdiction.
An official report from Sekmai police station in Imphal West district said the bomb attached to a vehicle at the roadside exploded when a CRPF party was passing through the area, about 20 km north of Imphal.