Three people including a woman were killed and 15 others were injured as an inter-city bus lost control and crashed against a bridge at Bankkali in Dinajpur.
The identities of the deceased could not be known yet, police said.
The accident occurred at around 8.30 pm on Monday.
Kotwali police sub-inspector Mahbub said a coach of Ahsan Paribahan, on its way to Dhaka from Thakurgaon, lost control after one of its front wheels punctured at Bankkali area of Dinajpur district headquarters.
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It then rammed into the railing of a bridge, leaving several of its passengers injured.
They were rushed to M Abdur Rahim Medical College Hospital where two people were declared dead. Later a woman died while undergoing treatment, SI Mahbub said.
Seriously injured 15 people were being treated at the hospital, he added.