"We've requested the higher authorities to take measures to interrogate the four at the TFI to find out about their motives and links," said Investigation Officer (IO) of the case Sub-Inspector Manjurul Haque Akand.

The arrestees--Nurunnabi alias Tara Mian, his assistant Abdur Rahim alias Darbesh, and Rahim's parents Salahuddin and Amena Khatun--were placed on a three-day remand each yesterday.

Police sources said as the Dhanmondi police could not obtain any leads from the arrestees, they have communicated with the higher authorities for the four to be quizzed at TFI.

Meanwhile, curator of Bangabandhu Memorial Museum Syed Siddiqur Rahman said they have beefed up security at the museum following the Monday's incident. "We have increased the manpower to ensure proper security on our part," he said.

ARRESTEES REMANDED
The IO of the case produced the arrestees before the Chief Metropolitan Magistrate's Court, Dhaka with a prayer for a 10-day remand for each.

But the court granted three days' remand.

In the forwarding report, the IO mentioned that the detainees seem to be the members of a militant group.

Primary investigations suggest that they have been in contact with the militants across the country and had plans to carry out destructive activities. So, they need to be interrogated thoroughly.

Security guards caught Nurunnabi while he was cutting electric cable at an under-construction building of the museum. Later his cohort Abdur Rahim and parents were captured.