A truck driver's assistant, who suffered burns in a firebomb attack at Shahjahanpur in Bogra on Saturday night, died in a hospital on early Sunday.

Hasib, 30, was from Kazipur in Sirajganj.

Four people were primarily burnt, two critically, after attackers hurled petrol bombs at a Bogra-bound truck near Rupihar in Shahjahanpur at about 8:30pm on Saturday, said Shahjahanpur Police officer-in-charge Abdul Mannan.

The injured were admitted to Shaheed Ziaur Rahman Medical College Hospital in Bogra.

The other injured are driver Golam Mostafa, a trader, Abdul Aziz and Jahangir Alam.