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Police said the accident was reported around 10am on Monday on the Dhaka-Bogra Highway at the northern district's Shahjahanpur Upazila.
"Three people were killed on the spot in the head-on collision between the trucks," local police OC Zia Latiful Islam.
He, however, could not provide the identity of the victims. Three others injured in the crash have been taken to the medical college hospital in Bogra.
The crash disrupted traffic on the highway for 20 minutes until the trucks were removed, said the police officer.