When one of them drowned, the two others tried to rescue him but met with the same fate, witnesses said
Muktagachha police OC Fazlul Karim said the accident took place at Kurhiparha around 7am on Friday.
He could not identify the victims at that time but said that all those killed were passengers of the auto-rickshaw.
OC Karim told bdnews24.com three of them were killed on the spot.
The two injured were rushed to Mymensingh Medical College Hospital, he added.