Update! The first article was kind of shitty and left out an important detail. He put on face paint to look like..... drum roll please...
The Joker!
Much more detailed
article.
From what the article said he is 20 and described as "thin, tall and ginger haired." The article also said he stabbed pretty much just heads and throats. He killed one employee and two kids. "Police and hospital sources said six children, between one and three, were seriously injured, another four suffered minor injuries. Last night they were all out of danger after surgery."