Miscreants hurled crude bombs at the Prison headquarters and the car of BSMMU director in Bakshibazar and Shahbagh of the capital yesterday.
Two men on a motorbike threw two crude bombs before the headquarters of the Department of Prisons near Dhaka Central Jail around 10:00am and fled the area.
One bomb exploded on the spot while police recovered another live after the attack, Sub-inspector Nasibul Hasan of Chawkbazar Police Station told The Daily Star.
The prison authorities lodged a general diary with Chawkbazar Police Station in this regard.
Inspector General of Prisons Brig Gen Syed Iftekhar Uddin said earlier some unidentified callers issued threats to the jail authorities of Chittagong, Sylhet and some other places for releasing some prisoners.
Bangabandhu Sheikh Mujib Medical University Director Abdul Mazid Bhuiyan told The Daily Star that miscreants hurled two crude bombs at his car before Hotel Ruposhi Bangla while returning home from the office around 4:30pm.
The right side of the car was damaged in the attack, he said.
He filed a case with Shahbagh Police Station in this connection.
He said miscreants also hurled a crude bomb at him on the BSMMU campus two months ago.
They also gave death threats over the phones several times recently, he said.
He suspects that there might be a link between yesterday's bomb attack and the bomb attack in BSMMU where few war crimes convicts and political prisoners have been kept.
Sirajul Islam, officer-in-charge of Shahbagh Police Station, said they took the car as evidence.
They were yet to identify persons involved in the attack, he added.