An Assam Rifles soldier opened fire at six of his colleagues and then shot himself dead in Manipur last night - in an incident that authorities claimed was not related to the ongoing ethnic conflict. The incident occurred in an Assam Rifles battalion deployed near Myanmar border in south Manipur, one of the remotest areas that used to be a hotbed of insurgency. Assam Rifles - a paramilitary force - guards the borders. All the six injured soldiers are non-natives of Manipur, the police said in a statement.