The two militants identified as Nazir Tarian Dabede (25) and Siraj Shamshudeen Shamas (33) were handed over to India's Border Security Force (BSF) by Bangladesh BDR on Wednesday, Dec 2.
Nazir on Thursday, Dec 3 confessed to the interrogators of the Meghalaya police and BSF that, he planted the bombs in Bangalore along with an accomplice called Rahim.
However, the detained men continue to deny involvement in the 2005 IISc attack, an official, who is also a part of the interrogation team, told a news agency.
India was able to get its hands on the two men after BSF tipped off its counterpart in Bangladesh about the militants' presence in the country.
Nazir and Siraj, both from Kerala, have reportedly been in Bangladesh for over a year.
The official, who spoke on the condition of anonymity, said that the duo have not only spilled the beans on the terrorist bases in south India, but also on the bases in UAE, Qatar and Bahrain.
Bangalore police is expected to take the two men into custody on Thursday, Dec 3.