Miscreants hurled three petrol bombs at the chief election commissioner's village home in Jibonnagar upazila of Chuadanga early yesterday.
Locals and police sources said the incident happened soon after a patrol team of police left the house of CEC Kazi Rakib Uddin Ahmed around 2:30 am.
No one was injured as the bombs landed outside the entrance gate of the home.
Shikder Mashiur Rahman, officer-in-charge of Jibannagar Police Station, said "Miscreants hurled the bombs at the time of changing shifts of policemen. Only two bombs had exploded."
On information, a team from Shahpur police camp rushed to the spot and defused the unexploded bomb, he said.
No one from the CEC's family lives in the house. A caretaker looks after the house on temporary basis, he added.
Additional police forces have been on-duty at the house since December 3.
The attack happened at a time when the Election Commission is going to hold the 10th parliamentary elections amid the opposition boycott.