Six of the 13 arrested for distributing child pornography remain in custody, NOVA reported.

They were arrested on Friday following an action by the prosecutor's office, the National Investigation Department and the GDBOP. 

Borislav Sarafov: Half of those detained for child pornography are families with children

Various district courts across the country found sufficient evidence that the 13 men provided video footage of brutal scenes of child sexual abuse.

In the mass case, the detainees claimed they did not know it was a crime.

At the request of the state prosecution in Stara Zagora, Devnya and Elin Pelin - four of the detainees remain in custody.

The prosecutor's office in Sofia wants the most severe measure for all five detained in the capital.

Tomorrow in Haskovo and Varna, the last measures to keep the detainees in the special operation of the investigation, the anti-mafia and the prosecutor's office from Friday will be seen.