The strike was carried out by commandos on specific intelligence input in coordination with Myanmarese authorities, with the Army saying that "significant casualties" had been inflicted on two militant groups believed to be NSCN(K) and KYKL.
Sources said about 15 insurgents were killed in the assault with no casualties among the soldiers.
Noting that the army had been on "high alert" after Manipur attack, Major General Ranbir Singh, Additional Director General Military Operations, said that in the course of last few days, "credible and specific intelligence" was received about further attacks that were being planned within Indian territory.
"In view of the immenent threat, an immediate response was necessary. Based on intelligence, we conducted operations to counter these planned assaults," Maj Gen Singh added.
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He asserted that "any threat to our security, safety and national integrity will meet a firm response" while ensuring peace and tranquility along the border and in the border states.
While he said the operation was carried out "along the Indo-Myanmar border at two locations, along the Nagaland and Manipur borders", sources said the strike was carried out inside Myanmar with the coordination of local authorities.