Principal name and Address.
I am writing this letter to inform you about the misbehaviour of a few students belonging to high school during recess.
They were constantly misbehaving with other students by bullying younger kids
and were causing a lot of trouble to not only them but also to the other kids playing around.
Please take immediate action about this as otherwise it may cause a lot of trouble and disturbance in the school campus during recess and may hurt someone badly.