Kachin state in Northern Burma has been the scene of bloodybr fighting between ethnic minority rebels and the Burmese army since abr 17-year ceasefire broke down in June two years ago.br br In the last few weeks the conflict has intensified.br br The Burmese army has admitted to using fighter jets to attack thebr rebels but maintains that it is only acting in self-defence.br br The Kachin, who are fighting for greater autonomy and ethnic rights inbr Burma, say the army is advancing on their headquarters.