KABOOM.

Me nad Ian were walking up to ML, and we were not even on the 1st floor yet when there was a big bang.
We started panicking and were like WTF WAS THAT!
Then we ran down cause we heard people screaming and stuff then Mr Mann came out with a few other people and he was like WHAT WAS THAT WHAT IS GOING ON EVERYONE CALM DOWN.
Seriously the ground was like shaking and you could feel the boom.
After that more people were coming out then we all went to the carpark area infront of the carpark court on the secondary building side cause we saw people evacuating and stuff.
Ian said the grenade he felt in Cambodia was exactly the same as that.
It was a gas explosion in one of the apartments.
We saw smoke everywhere after that.
We were told to go back to our classes.
Seriously the whole school was in panic.
We were so scared :P