The suspect in the murder of a university student in Busan told police that she was being manipulated by a stranger during her first interrogation, according to a news report on Sunday.

Suspect Jung Yoo-jung said she "was told by a stranger to steal the identity of a woman they had murdered," while refusing to admit to the murder, broadcaster JTBC reported, quoting the notes from the police interrogation on May 27.

But police concluded that her statement was false after examination of surveillance camera footage showed no one else had entered the house of the victim before she died.

Separately, security camera footage revealed Jung walking briskly while carrying what appeared to be parts of the victim's body in a bag.

Jung is suspected of having approached the university student around her own age who was looking to tutor a middle school student by pretending to be the mother of the student.

On May 26, Jung switched roles from mother to daughter, disguised herself as the middle school student, and asked to take a class at the victim's house, according to police.

The victim was alone at the house when the murder took place. Jung left the victim's home with the bag, took a cab to the Nakdong river and disposed of the bag there.

Jung was arrested on May 27 after the cab driver reported the case to the police.

Jung's case was referred to the prosecution service as the police seek charges of murder and abandoning a corpse.