Rules of Engagement

"Yesterday during my returning home from work, I usually use a relatively safe road near the river, before I reached the end of the road I heard a shooting of high caliber machine gun, looking in front of me I saw two Stryker’s vehicles; one of them is shooting with the heavy machine gun towards the river.
I tried my best to find what he was shooting at , but nothing was their in that river , he continued that way for about 12 minutes , then they start moving again after a big traffic jam behind him .
This kind of actions increase anger of civilians, terrifying them for no reason.
If you ask any one of the attendences in the street at that time ,why they are doing so ?"
A Free Writer