Police have detained the father-in-law of Zakaria, who was held for his involvement with JMB militants snatching, from Chandra Trimore area under Kaliakoir upazila.
The detainee is Sabbir Ahmed, 55, and he is from the Naugaon district.
Kaliakoir police station Officer-in-Charge Omar Faruk said: “Acting on a tip-off, police detained Sabbir Ahmed along with one Shamim on a bus around 11am.
The detainees were sent to Gazipur police super’s office for quizzing,” he added.
Earlier, police held Zakaria’s wife Shapna after taking her from her Tangail house.
On Sunday, miscreants snatched three condemned JMB militants while they were being taken to Mymensingh from Kashimpur jail, Gazipur, after hurling bombs at the police van.
A police constable died in the incident.
Later, police managed to recapture one of the militants Rakib, who was killed in“crossfire” early Monday.
Police also held Zakaria and Rasel for their involvement with the attack.
However, two remaining militants Salauddin Salehin and bomb specialist Mizan are still on the run.
The incident took place weeks after the issue of militancy surfaced anew in Bangladesh with the clip of “al-Qaeda” calling Muslims to wage Jihad against anti-Islamist forces.