A crude bomb went off outside the rented house of Bangladesh Jamaat-e-Islami candidate Adv Yakub Ali Chowdhury, who is contesting the election from Khagrachhari.
According to Jamaat-e-Islami, the explosion occurred around 10PM on Tuesday in the Shalbagan area of Khagrachhari town, near the Development Board rest house.
Yakub Ali was not at home during the explosion.
Khagrachhari Sadar Police Station OC Mohammad Kay Kislu said police visited the spot after receiving the complaint.
"The house owner and nearby residents heard a loud sound resembling an explosion, but no visible evidence was found at the scene," he said, adding that a piece of plastic was collected for forensic examination.
The OC also said the sound could have originated from a firecracker or fireworks.