The IED, which was planted at 27 Assam Rifles check post at Ramva, exploded at 7.20 am.
Police and Assam Rifles personnel have cordoned off the area, which falls under Sangshak police station limits in Ukhrul district.
A combing operation was on.
This blast is the second such attack on the paramilitary force in Manipur this month.
On June 15, an Assam Rifles personnel was killed and three others were injured after militants had triggered an IED blast in the same district.
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