new delhi indian troop exchange gunfire wednesday separatist guerrillas remote northeastern region border myanmar kill wound several insurgents army officials say army carry operation separatist group believe 2,000 guerrillas battle independent great nagaland state carve india army patrol retaliate swiftly upon come heavy fire rebel indian army eastern command headquarter city kolkata say statement heavy casualties reportedly inflict nscn-k cadre say use acronym group national socialist council nagaland-khaplang casualties suffer indian security force wednesday operation confine indian side border add 2015 indian special force cross myanmar hunt guerrillas group take shelter neighbor country year group launch series attack security force india northeast scrap ceasefire observe new delhi since 2001. recent years militaries india myanmar build close tie pledge allow insurgent group shelter territory india condemn attack august rohingya insurgents security post myanmar rakhine state provoke military crackdown cause hundreds thousands rohingya muslims flee country indian troop firefight rebel near border myanmar