The USA has the most dynamic reality show of a new school shooting every week this year. (22) 2018
This week the fatalities are fewer than 10 so it is no where near the record for mass shootings however the shooter is getting originality points for pulling a fire alarm to maximize targets.

The remains of one victim was under 42kg so she was indeed a small price to pay for freedom that isn't free but with profits thru the roof.
With sports betting now legal for states to decide it won't be long before the sport of school shootings will obviously attract lots of bets.

The long shot bet is still the Vegas record holder at 60 fatalities
The trifecta bet of guessing the State, type of school and the number of dead is still unclaimed.

GOOD LUCK