The deceased were part of the security convoy of Chief Minister N Biren Singh who had gone to Tamenglong district headquarters to inaugurate a hospital.
The accident occurred at around 5 pm when one of the escort vehicles fell into a gorge while returning to capital Imphal from Tamenglong town.
The deceased have been identified as Havildar Somorjit, Riflemen Dominic and Kh Bungo, a police officer said.
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