After a slight decrease from severe levels, the mercury is hovering around 40 degrees Celsius in most regions
The accident took place in the upazila’s Nuniyagari area on Saturday, police said.
The dead were identified as construction workers Zakir Hossain, 25, Khasru Mia, 55 and Raju Mia, 28.
Four of the wounded were rushed to Bogra’s Shaheed Ziaur Rahman Medical College Hospital while the rest were admitted to the Palashbari Upazila Health Complex.
The Bogra-bound bus hit punctured a tire near the Sarkar Petrol Station, causing it to veer out of control and hit the other vehicle, said Inspector Abul Basar of Gobindaganj Highway Police.
The three died on the spot, he said.