What tv show listed a bunch of different massacres from 10 to 1.?

Some of them included a guy stealing a tank and rampaging through a city, kids circling a playground with snipers and shooting classmates, a community firing back at a gunman up in a tower pinning him down, and i think i remember a mall massacre. Any ideas of the tv show title?thank you!

I'm almost positive this is it: Going Postal: 15 Most Shocking Acts of ViolenceI watched that the other week and it had all of those events you just described in it's top 15 list.