GUWAHATI: At least seven rebels were killed in a gunbattle between rival factions of a separatist militant group in India's remote northeastern state of Nagaland, police said on Friday. The clash occured on Thursday between two warring groups of the National Socialist Council of Nagaland (NSCN) in a village in the Athibung area.The NSCN has been fighting for a separate homeland for Naga tribespeople. More than 20,000 people have died in the nearly six-decade-old revolt in the Christian-majority state. The Issac-Muivah and the Khaplang factions of the NSCN have been holding a ceasefire with Indian forces as part of a peace process, but are fighting each other in a war of supremacy.