SUNAMGANJ, Bangladesh (AP) _ A bomb exploded at an opposition rally in northeastern Bangladesh on Monday, wounding nearly 40 people, a witness said.

Suranjit Sengupta, a lawmaker from the Awami League party, had just finished addressing hundreds of supporters when the bomb went off in Sunamganj district, 177 kilometers (110 miles) northeast of the capital Dhaka.

The lawmaker was not hurt, Habibur Rahman, a journalist who was covering the meeting told The Associated Press by mobile phone.

The bomb appeared to explode underneath a wooden stage where the lawmaker had just given his speech, Rahman said.

Fifteen of the more seriously injured were sent to a hospital in nearby Sylhet town, 60 kilometers (37 miles) southeast of Sunamganj, he said.