Jakarta – The Indonesian government on Wednesday warned that it will get tough against separatist movements in Aceh and Irian Jaya provinces at opposite ends of the far flung archipelago.

Coordinating Minister for Security and Political Affairs, Susilo Bambang Yudhoyono, warned separatist leaders in the easternmost province of Irian Jaya that celebrating the 39th anniversary of their declaration of independence next month would be treason.

Yudhoyono said he had heard reports that Free Papua (OPM) separatists planned to celebrate the commemoration on December 1. "If that takes place, it will be considered an act of treason and the government will take stern actions based on the constitution," he said.

Yudhoyono also warned Free Aceh Movement (GAM) guerillas that Jakarta may declare a state of emergency in the rebellious province of Aceh if separatist violence keeps up despite a shaky truce between the two sides.

"If alternatives proposed are rejected, the government will adopt legal measures and deem it necessary to impose an emergency status, although it's not an ideal thing to do," Yudhoyono said after meeting with Vice President Megawati Sukarnoputri.

Yudhoyono also warned the popular Aceh pro-independence group, the Information Center for an Aceh Referendum (SIRA), against mobilizing people against the government.

SIRA earlier this month mobilized hundreds of thousands of people during a two-day rally organized to demand a referendum on self-determination for the strongly Muslim region on the northenr tip of Sumatra island.

They marked the anniversary of last year's first public call for a vote on self-rule, which was attended by almost a million people. On November 14, independence supporters also issued a declaration in favour of the province breaking away from Jakarta through a UN-sponsored referendum.