Abusive behaviour of Metrorail Security

I'm deeply disturb with Prasa Metrorail, as i Witnessed today how two of their Security officers assaulted two children on their suspicion that they were going to commit a crime. They had stones in their hands! If it was wrong of this boys to board a train with stones in their hands(I did'nt see any stones, thus i do not know how many stones or was it one stone each. I confronted these officer and the started to push me away and said i should go and open a case at SAPS. My reasoning is that they had no right to hit this boys with the fist. They made sure that they hit them where no marks will show, but I'm witness to the fact that they assaulted those youngsters(could be 12 years olds). https://www.facebook.com/groups/Eersteriver/permalink/ ********** ********** 058/