Police have identified the attacker as ‘Bandhon’.
They say they had been looking for five of the dead attackers, who had been listed as suspected militants.
Bogra Superintendent of Police Md Asaduzzaman told bdnews24.com on Sunday that three persons had been taken into custody to identify Bandhon.
Md Imran, the local union council chairman in Shajahanpur Upazila, said the name of the person identified as Bandhon is actually Md Khairuzzaman, a madrasa student who has been missing for a year.
“Police have picked his parents and brother-in-law up,” he said.
Another attacker, identified by police as ‘Bikash’, is also reportedly from Bogra.
Bogra SP Asaduzzaman, however, said he did not know of Bikash.
Police identified the three other attackers as ‘Akash’, ‘Don’, and ‘Ripon’.
The assailants took a number of hostages and killed two policemen, who had earlier tried to end the siege.
Commandos stormed the eatery on Saturday morning and rescued 13 hostages. The Army said six attackers had been killed and another caught alive during the rescue operation.
It also said 20 hostages were found dead on the premises. Seventeen of them are foreign nationals.
Radical group Islamic State has also reportedly published photos of the gunmen.
Four persons seemed to be in both sets of photos published by police and IS.