France's former President Nicolas Sarkozy began his five-year prison sentence on 21 October, after being found guilty of conspiring to fund his 2007 presidential campaign with illicit funds from Libya's former leader, the late Muammar Gaddafi.
In one social media video analysed by Euronews' verification team, The Cube, an inmate can be seen filming a video through the bars of his prison cell.
Pointing across to the other side of a prison courtyard, he says, "Sarko [Sarkozy] is just there in the isolated section, all alone in his cell."
The inmate goes on to shout, "We know everything, we're going to avenge Gaddafi.
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