Child protection representative Kamal Abdel-Allawi told
The New Arab that the photo was taken after Tunisian security forces foiled an attempted border crossing, and is believed to have been taken at a security centre in the Meknine region of Monastir Governorate.
Abdel-Allawi said seven people were arrested and the operation's organiser, who is also the child's father, remains in custody.
Abdel-Allawi said that the NGO Childhood Protection Mission soon raised the alarm about the four-year-old girl, her six-year-old brother, and another 17-year-old child, at the detention centre.