Dhaka has refused to sign an extradition treaty despite New Delhi's persistent requests, India's High Commissioner to Bangladesh Veena Sikri said.
"Despite India's repeated requests and submission of proposals and the draft text of an extradition treaty, the Bangladesh government is yet to respond positively," Sikri said.
Bangladesh, which shares a 4,206-km border with India, has one such treaty with Thailand.
"New Delhi had submitted the draft proposal and text to Dhaka three years back and the matter was discussed at various forms and meetings," said Sikri.
The Indian envoy was in Tripura's capital Agartala as part of the Indian delegation to the Indo-Bangla Joint River Commission (JRC) that on Friday visited disputed water projects and land strips along major rivers that separate the two countries.
"India again raised the issue of signing an extradition treaty at the seventh home secretary-level four-day talks between the two countries in Dhaka in August," she said.
Asked about media reports regarding Anup Chetia, general secretary of the outlawed United Liberation Front of Asom (ULFA), taking shelter in Bangladesh, Sikri said: "We have no concrete information and evidence about the ULFA leader's latest movement."
India has been seeking extradition of Chetia and a few top terrorists leaders of various outfits of the northeast from Bangladesh.
"Despite New Delhi's repeated requests, Bangladesh never gave any information about the Indian terrorists who have been killed by security forces of that country on various occasions," the high commissioner said.
India has repeatedly been maintaining that separatists from the northeast have bases inside Bangladesh from where they carry out their hit-and-run guerrilla strikes. Dhaka denies the charges.