In a setback to ULFA, Bangladeshi security agencies have launched a crackdown on their leaders there, forcing them to flee.

In another development, two leaders of the banned outfit have surrendered to the BSF.

Self-styled ULFA foreign secretary Sashadhar Choudhury and self-styled finance secretary Chitraban Hazarika surrendered at Gokulnagar along the Indo-Bangla border in Tripura, informed a BSF official.

The two were reportedly trying to enter India when they were spotted by the troops and made to surrender, he said.

Intelligence agencies said Bangladesh security agencies have raided some hideouts of the leaders of the outfit this week, prompting the cadres to flee.

ULFA chairman Arabinda Rajkhowa was said to be absconding as he slipped away hours before the raid in three different locations, according to intelligence inputs.

ULFA 'commander-in-chief’ Paresh Barua is currently camping somewhere in China, the inputs said, adding some of the cadres might have been detained by the Bangladesh security agencies.

Official sources said BSF has put its troops along the Bangladesh border on maximum alert apprehending that more ULFA cadres might try to sneak into India following the crackdown in that country.

Earlier, the new Awami League government of Sheikh Hasina had assured New Delhi of all support and cooperation to evict Indian separatists, if any from Bangladesh soil. ULFA general secretary Anup Chetia is under detention in Dhaka after his arrest in 1997.

Though Chetia, arrested on charges of entering of the country without passport and possessing satellite phone, completed his jail term in 2005, he is in detention due to the absence of any extradition agreement between the two countries despite New Delhi's formal appeals to hand him over for trial in India.