About 50 students who were chained and kept in the basement of a religious school were rescued by the Karachi police in Pakistan on Tuesday.

The group, ranging from boys to middle-aged men, ages 12 to 50 years, were routinely beaten and deprived of food by the authorities of the madrassa.

Some of them were beaten 200 times and were told they would be sent to join the jihad and would get 200 lashes if they tried to escape, the BBC has reported.

Some of the young men were sent to the madrassa by their parents to cure their drug addiction while some for other crimes.

Have a look at the state of the students when they were found by the police.