LIVE VIDEO: White House Correspondents Dinner Nicolet High School Student attacked by "ninja" in woods near school Myra Sanchick FOX 6 Reporter 9:54 AM CDT, April 29, 2010 WITI-TV, GLENDALE - A high school student is recovering from a large gash in the head. Police in River Hills are investigating the case of the masked attacker.  The attack happened in the woods near Nicolet High Scho More..ol along the Milwaukee River. Police say kids were walking through the woods when someone dressed like a ninja confronted them. He mentioned he was "protecting the woods" and then slashed one boy’s forehead. The boy needed twenty stitches to close the wound. Police say there are indications the machete cut right through to the boy's skull. Police arrested the 16-year-old attacker at his home. When they went to his room, they found the machete involved in the attack and another sword under the boy's bed. The 16-year-old boy has been referred to the Milwaukee County Children's Court and he's awaiting charges.