Nun was trying to prevent six men from robbing the Christian school . Gang claimed to have gagged security guard before violent rampage . video footage released shows suspects entering the school 's staff quarters . while others have been detained for questioning , police reported . Latest in a string of violent gang - rapes that has shocked the country .
Nun was trying to prevent six men from robbing the Christian school . Gang believed to have gagged security guard before violent rampage . CCTV footage released shows suspects leaving the school 's staff room . Five others have been detained for questioning , police said . Latest in a series of violent gang-rapes that has shocked the country .