Parents have been advised to prevent children from being outdoors until sunset
The accident occurred in the upazila’s Kushurpara area on Sunday afternoon, said Porsha Police Station OC Rafiqul Islam.
Three of the dead were identified as Kasna Village residents Abdul Salam, 50, Ashraful Islam, 42, and Hira Begum, 60.
The injured have been admitted to Porsha Upazila Medical Complex for treatment.
The autorickshaw was going from Shoraigachi to Kasna when it was rammed from behind and overturned by a bus headed to Porsha, OC Rafiqul said. Two died on the spot.
Five were sent to the hospital with injuries and two of them died on the way, OC Rafiqul said.