the attacker placed a projectile - proof vest under his clothes and a backpack featuring a knife , an arrow and a fake pistol . two other knives were found in the crime scene . the fbi confirmed that the man ' s face was painted white with blackened lips as he committed the crime , which led worldwide sources to create comparisons to the joker , the antagonist from the batman series . " i have a question , " the shooter told the first employee he noticed , after which he immediately stabbed her , and started his rampage . three female day treatment worker attempted to comply the killer while people locked the doors . the bomber stabbed employees trying to carry children to death .
Joker appears in the Batman series.