It's hard to imagine what the men and women incarcerated in Syria's notorious Al-Khatib prison had to endure.

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Now a court in Germany will give its verdict in the case of a man accused of presiding over systematic mass torture and killing of those detained there.

Anwar Raslan, 58, is charged with crimes against humanity in the Damascus jail known as "Hell on Earth".

The trial in Koblenz is the world's first criminal case brought over state-led torture in Syria.

At the heart of it is a man alleged to have been a high-ranking security service officer under President Bashar al-Assad as mass anti-government protests were violently crushed in 2011.

Many protesters and others suspected of opposing the regime were rounded up and detained in the Al-Khatib facility in Damascus where, prosecutors say, Mr Raslan directed operations.

Charging him with 58 murders as well as rape and sexual assault, they accuse him of the torture of at least 4,000 people held there between 2011 and 2012.