After having fled his home village of A'zaz, Mazin Hammoush was residing with his family in Al Jamelaiah neighbourhood of Aleppo. On June 9, 2013, local policemen arrested him before taking him to the police station of Al Jamelaiah. He was suspected of not holding a valid rental agreement. His family was later informed that one of Hammoush’s relatives reported him to the police, accusing him of being the deputy leader of an armed group affiliated with the opposition.

About a week after his arrest, he was transferred to the criminal security service branch and subsequently to a branch of the military police in Aleppo, where his wife was able to visit him until September 2013.

In November 2013, his family went to the military police to visit him but was informed informally that he had been transferred to Sednaya prison. In February 2014, his wife tried to enquire about his fate and whereabouts with the military police in Qaboun, who informed her that her husband had been sentenced by a military field court, thereby preventing him from receiving family visits in prison. Since then, she has received no further information about him.