THE Tripura government is under siege again—the insurgent All-Tripura Tiger Force (ATTF) has served a notice to all non-tribals to leave the state by July 10 or face death. For a state reeling under militancy of various hues, this is not an extraordinary situation but the police are gearing up for an emergency. Says one police officer: "At one level, the notice is absurd because 75 per cent of the state's 28,00,000 population is non-tribal. But we cannot take any chances in view of the escalated ATTF activities this year."