A pregnant woman along with her twins in the womb died following kidney surgery at a private hospital in Mymensingh early Friday, claimed the victim's family members.
The deceased, Rekha Akhter, 25, wife of Mahbub Alam of the district's Trishal upazila, was 13 weeks pregnant.
Rekha was admitted to Patient Care Hospital for kidney-stone surgery on Thursday night. Rekha's condition deteriorated in the operation theatre after her kidney stones were removed.
Later, she was sent by ambulance to Chorkhai Community Based Medical College Hospital in Mymensingh.
On the way, Rekha and her unborn twins died early Friday.
Her relatives held a demonstration in front of the hospital along with her dead body.
Meanwhile, since the incident, the owner of the clinic and the doctor remain absconding.
The victim's husband, Mahbub Alam, filed a case against six people at Kotwali model police station on Friday night, said OC Shah Kamal Akand.
The accused in the case are Patient Care Hospital owner Mohammad Rafiq Mia, 35, Amit, 30, Dr Ashraful Haque Molla, 40, Dr Arif Rabbani, 31, Mehdi, 27, and Tarek Mia, 30.
Besides, around seven unknown people have been accused in the case.