The two men were arrested after the body of 16-year-old Medine Memi was found with her hands tied, buried in a sitting position in a hole inside a chicken pen at her family home.

The hole where Medine Memi was allegedly buried by her relatives

She had been missing for 40 days before she was uncovered by police who were acting on a tip-off in the mainly Kurdish town of Kahta.

A post-mortem showed a significant amount of soil in her lungs and stomach, indicated she had been buried alive, forensic experts have said.

Her father Ayhan Memi, 40, and grandfather Fethi Memi, 65, refused to talk to the authorities after their arrest in early December.

Ayan Memi is reported to have said in his testimony that the family was unhappy she had male friends.

The judicial source said it is expected the pair will be charged with "premeditated homicide with aggravating circumstances, perpetrated with cruelty".

Under Turkish law the pair will face life in prison if they are convicted of the charges.

Muhammed Cevik, owner of the local Kahta newspaper in Turkey's Adiyman province, said the teenager "never went to school and perhaps barely knew how to read and write".

It is thought Medine died in an honour killing, in which a female relative is killed for allegedly tarnishing the family reputation.

Honour killings are most prevalent in Turkey's mainly Kurdish south east and claim many victims every year.