Police said a driver and a trader were killed and three others injured when suspected activists of main opposition Bangladesh Nationalist Party (BNP) and its fundamentalist ally Jamaat-e-Islami hurled petrol bombs on an onion-laden truck at northwestern Hakimpur of Dinajpur district overnight.
"The driver apparently lost control over the wheels as the truck caught fire...It overturned and fell into a roadside ditch," a police officer said, adding that the driver and the trader were burnt to death.
Witnesses said several youths hurled a petrol bomb which landed at the front side of the bus, critically injuring the driver and two passengers who were immediately rushed to the burn unit of Dhaka Medical College Hospital.
Doctors at the unit said the wounds of the 40-year-old woman appeared critical as 64 per cent of her body was burned.
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All the five education institutions were supposed to be used as polling centres during the 10th national elections on Sunday.
Election commission officials said security vigil was intensified at identified trouble-prone areas following the acts of sabotages.
The BNP-led 18-party opposition alliance has been demanding Prime Minister Sheikh Hasina's resignation and scrapping of the polls. The BNP has refused to field candidates, saying elections under Hasina will be rigged - an accusation the premier strongly rejects.