Assailants hurled homemade bombs at ruling party members in two separate attacks in southwestern Bangladesh.
The attack injured at least 22 people, including staffers chatting in front of a party office, police and media reports have said.
Nobody claimed responsibility for the attacks late yesterday in Jessore and Chuadanga districts.
The injured belong to the Bangladesh Nationalist Party and investigators suspect the attack could be the work of Maoist militants, according to Manik Barua, a police official.
"We are hunting for suspects," Barua said. "We need detailed investigation."
A similar attack late on Saturday in neighbouring Chuadanga district injured two other ruling party members, the Prothom Alo daily reported.
Assailants hurled a homemade bomb at the two while they were on their way to the party office, the newspaper said.