Agartala/Shillong, Aug 18 - The chief ministers of northeastern states have asked for tightening of security along India's border with Bangladesh and Myanmar, with the boundaries being frequently misused by insurgents from the region.

India should persuade Bangladesh through national and international channels to prevent terrorists from the northeast from taking shelter in that country, says Tripura Chief Minister Manik Sarkar.

'New Delhi should sign an extradition treaty with Dhaka to get back militants detained by Bangladesh authorities,' Sarkar said while addressing the meeting a conference on internal security which was attended by chief ministers and home ministers in New Delhi Monday.

Sarkar, who returned here Tuesday, told the meeting: 'Last month seven dreaded guerrillas of the Manipur-based People's United Liberation Front (PULF), having established links with Pakistan's Inter-Services Intelligence (ISI) and (who were) trained in Bangladesh, were arrested in Agartala while in transit from across the border.'

'This again confirmed that Bangladesh continues to be the place of shelter for northeast militants, with Tripura being used as a corridor for their movement.'

Inaugurating the one-day conference, Prime Minister Manmohan Singh had said the northeast needed to emphasise on proactive state police forces instead of exclusively relying on the central paramilitary forces and the army.

Tripura is the only state in the northeast where militancy has been curbed to a large extent with two-and-a-half decades of terrorism now showing signs of abating.

Sarkar urged the centre to take up with Dhaka problems arising out of the continued insistence of Bangladesh on erecting the border fence 150 yards away from the zero line.