The young people disappeared from Truso Gorge four days ago are in Tskhinvali isolator.
The friends who went o hiking on Friday were lost and detained by Russian occupants are charged with illegally crossing the border.
Information about their whereabouts was provided to their families in Mtskheta-Mtianeti police.
"They went on Saturday morning to Truso Gorge and should be back on Tuesday morning. I had a conversation with him on Sunday evening and everything was fine, as my son told. Yesterday I was contacted by Mtskheta Investigation department. They told me that my son is detained for illegal crossing of the border, "Tamar Tsisakadze said.