Syrian authorities are committing torture on a "massive scale" in government prisons including beatings, electric shocks, rape and psychological abuse that amount to crimes against humanity, Amnesty International said in a new report late on Wednesday.

More than 17,700 people are estimated to have died in custody in Syria since the country's conflict began in March 2011, an average of more than 300 each month, the watchdog said, according to AFP.


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