Shafii Hassani was woken up in his flat by people banging on the door to alert him that his younger brother Abdilah Muhamed Sugu was being beaten by police downstairs.

Sugu, 28, died in the early hours of Monday morning at Panama House — a block of flats in the Johannesburg CBD — when Gauteng police were conducting a raid at 3.30am after receiving a tip-off that there were people dealing in drugs in the place...