Nearly 50 people were wounded when a bomb exploded on Monday at an opposition rally in Bangladesh's north-eastern district of Sunamganj, witnesses and private television networks said.
The bomb went off after a senior leader of the main opposition Awami League party, Suranjit Sengupta, finished addressing the rally in his constituency of Dirai, about 350 km (210 miles) from the capital, Dhaka.
Nearly 30 people were hurt in the blast, a police officer at Dirai said by telephone.
Suranjit, a member of parliament, escaped unhurt, witnesses and media said. Suranjit, speaking by phone, told Reuters one man died in the blast but police did not confirm the death.