Law enforcers comprising police and RAB Friday recovered more than 25 kgs of bomb-making materials, including 15.5 kgs of explosives, from Tangail district, report agencies.
They also arrested three suspected members of banned Jama'atul Mujahedin Bangladesh (JMB) in this connection.
According to RAB, they recovered 12.5-kg gunpowder contained in 25 packets, one kg of explosive gel, two kgs of carbon powder, 10 kgs of fishing net iron balls, three detonators and five batteries.
RAB and police said, acting on a tip-off, the detective branch (DB) of police arrested one Mollah Amanullah from Baruha village in Delduar upazila.
Following his confessional statement that bombers were staying in Bhurbhuria area, they rushed to the area and arrested another youth Sohel, son of Anwar Mallik.
By searching a shed of hatchery in the village, they found the huge explosives and bomb making materials.
Meanwhile, the death toll in Thursday's suicide bomb attacks in Netrakona rose to eight with one more injured succumbed to her wounds at Mymensingh Medical College Hospital (MMCH) Friday.
The dead was identified as Shelly, 22, daughter of Sunil Paul, a resident of Ajahar Road in Netrakona.
Shelly was among hundreds of people who gathered as onlookers in front of Udichi office while the first bomb was being defused and the suicide bomber carried out the attack on the crowd.
In Comilla, police arrested seven people from different parts of the district on Thursday night, suspecting them to be members of the banned Islamic militant outfit JMB.
In Chapai-nawabganj, six bombs were recovered from the Wahedpur frontier under Sadar upazila in the district Thursday night.
BDR personnel said three persons carrying bags of paddy husk were going through a katkin field (kash flower) on the Panka Narayanpur char about 1.5 kilometres inside Bangladesh from the Wahedpur border.
In Sirajganj, police defused a powerful bomb kept outside the office of the Principal of Sirajganj Government College Friday.