The last time Rania (not her real name) spoke to her friend Mohamed Bachir Arab, was on 1 November 2011. As a hard working doctor and committed political activist, Mohamed had been living in hiding for six months, trying to evade the ever present tentacles of the Syrian intelligence forces, who routinely detain peaceful activists like him.
The following day her worst fears were realized. A strap line on the evening news announced he had been arrested. None of his relatives knew where he had been taken.
Mohamed was a marked man. He had been a student leader at his university in the city of Aleppo, in north-west Syria. Over the years, he had organized a number of protests against government policies, which had landed him in trouble with the authorities. Between 2004 and 2005 he was detained for several months before being released.
But this time, his relatives and colleagues feared it was different. Since the crisis in Syria began in March 2011, the number of individuals who have been detained in secret by the state – or forcibly disappeared – has spiralled out of control.