At least four workers were injured in Bonpara area of Jamalpur town in bomb explosion yesterday.
Local sources said the incident took place when the workers were digging a pond near the Bonpara Graveyard.
Abdul Awal, officer-in-charge of Jamlpur police station, said workers Sydur, Abdul Rahim, Rafiqul and Hasi got injured while an abandoned bomb exploded in the area.