Dhaka Metropolitan Police (DMP) yesterday formed a three-member committee to investigate the explosion incident inside the capital's Pallabi Police Station on early Wednesday.
The committee would try to figure out the nature of the explosive and whether it was handled properly inside the police station, according to an order signed by DMP commissioner Shafiqul Islam.
The committee, led by DMP Joint Commissioner (operations) Md Monir Hossain, has been asked to submit its report within three working days.
Monir told The Daily Star that they started an investigation but it was too early to comment.
The two other members of the committee are Rahmatullah Chowdhury, in-charge of the bomb disposal unit (BDU) at CTTC and Mahmuda Afroz Lucky, additional deputy commissioner (Darussalam zone) of Mirpur Division Police.
Meanwhile, two cases were filed against the three arrestees -- Shahidul Islam, Mosharraf Hossain and Rafiqul Islam -- with Pallabi Police Station on Wednesday night, said Walid Hossain, deputy commissioner of DMP.
According to the FIR, police arrested the three from Pallabi area around 1:55am on Wednesday, based on information that a group of criminals had gathered there.
Police also recovered two pistols, four bullets and a weighing machine from their possession.
During interrogation, the arrestees informed that there were explosives fitted inside the machine.
The arrestees also disclose names of their two associates Md Jony, 32, and Md Alamgir alias Nata Alamgir, 32, reads the FIR.
Police produced the three before a Dhaka court yesterday seeking a ten-day remand in each case.
In response, Metropolitan Magistrate Md Mainul Islam approved a total of 14-day remand -- seven days in each case -- for the accused said DC Walid.
Abdul Baten, additional commissioner (Detective Branch) of DMP, yesterday once again claimed that there was no militant link behind the blast.
On Wednesday, around 15 hours after the blast, SITE Intelligence Group which tracks the online activity of jihadist organisations and white supremacists said the Islamic State had claimed credit for the blast.