School and criminality

I would like to draw your kind attention to the danger that school boys are facing every day. In school areas some individuals are very much involved in criminal activities. They are known as 'boro bhai'. Innocent schoolboys fear these elements. They disturb the students in many ways and even snatch away mobile phones from them.
My younger brother is a student of Junior Laboratory High School which is situated in Dhanmondi 10/A. He is a victim of criminal activities. The school authorities did nothing about the incident in which my brother was harassed by some hoodlums in front of the school. They show reluctance to do anything against those criminals. As a result, the helpless innocent boys are facing great difficulties every day.
I hope the authorities concerned will take note of this issue immediately.