If you check my archives i think there are several instances like this in China going back several years.

Man stabs 28 children at kindergarten in China – Yahoo! News.

TAIXING, China – The screams of the 4-year-olds inside the kindergarten could be heard out in the street. When people ran in to investigate, they found what one witness said was a scene "too horrible to imagine" — blood everywhere as a knife-wielding man slashed 28 children, two teachers and a security guard Thursday in the second such school attack in China in two days. Experts called it a copycat rampage triggered by similar incidents Wednesday and last month.