The deceased were identified as Rafique, 28, of Cekormari village, Akbar Ali, 72, and his wife Nurima, 65, of Bodinajot village, Labu Islam, 25, and his wife Mukti, 19, of Majhipara village, Makud Hossain, 43, of Raypara village and Nargis Banu, 42 of Sahebjot village. All of them are from Panchagarh Sadar upazila.
Police and locals said the bus hit the three-wheeler while it was crossing an intersection at noon. Five people, including a new bride, died on the spot.
Another two passengers of the three-wheeler died while at Panchagarh Modern Sadar Hospital.
Abdul Quader Jilani, officer-in-charge of Bhajanpur Highway Police, confirmed the casualties.
Niranjan Sarkar, Panchagarh Fire Service Station officer, said they faced obstacles from agitated locals when they tried to reach the spot.
Dr Mansur Alam of Panchagarh Modern Sadar Hospital said locals also blocked the road and vandalised an ambulance of the hospital.