Fortunately, it wasn't a grenade - but we can see how the mistake might have been made. The item thrown was actually a canister of CS gas - what is commonly known as tear gas.

Fortunately, the canister was defective and did not detonate.

The GSU responded quickly, recovered the canister, and took it into custody. The story behind it will surely lave you shaking your head. According to our information, it was a dispute between two cousins. The younger one - who is only 16 - reportedly threw the canister at his older cousin - who was at a work site. We must point out that there were other young school children in the area as well.

Some reports form the scene say he threw it because of a dispute over a pair of boxer shorts that was borrowed without consent! So where did the canister come from? Well, experts say it could be BDF or British issue and might have come from a training session at the Pine Ridge.