[Cincinatus' Wife]

...In Mexico, when guns were so difficult to obtain, they simply used machetes and decapitated their victims....

Also mass killings in China (in schools) using knives, hammers, cleavers....

[knarf]

From Wicky;

"As most cases had no known motive, analysts have blamed mental health problems caused by rapid social change for the rise in these kinds of mass murder and murder-suicide incidents.[1]"

re China