The body of a three-year-old child, who police suspect was beaten to death, was found in a ditch in Phu Yen Province.
A local duck farmer, Duong Van Dai, discovered Nguyen Tran Thuan Thien's body on October 30.
Dai said he was fishing garbage out of a ditch when he noticed a bag with hair inside.
The 62-year-old said he had seen a woman throwing something into the ditch, around 20 meters from his farm, the previous night. She came on a motorbike with a man.
Forensic tests have shown that the child did not drown but was beaten to death. Police found 12 injuries to the head, caused by a rock or a cane.
Huynh Thi Nguyen, the baby's mother, told Thanh Nien on Wednesday she couldn't believe the body was that of her child.
"My whole family came to the scene and we were all distraught. He died under terrible circumstances," Nguyen said.
Relatives have said the family did not have any conflicts with anyone.
Police in the south central province are investigating the case.