Here are some articles for your reading pleasure in which people went on rampages with knives and did kill people.

This one is about a janitor who killed 8 children with a knife in a primary school in Japan back in 2001.

http://en.wikipedia.org/wiki/Osaka_school_massacre

This one is about a man in Belgium who stabbed two toddlers to death at a daycare in addition to harming some other adults and kids.

http://www.thefreelibrary.com/Toddlers+and+carer+die+in+knife+massacre.-a0192529169

And here is another one about a Brooklyn man who went on a stabbing rampage and killed a fair amount of people.

http://www.nypost.com/p/news/local/brooklyn/brooklyn_son_goes_on_killer_rampage_Y6MLOc4zE0uI3rgagp1RJM/0

I can link this kind of stuff all day if you'd like.