A knife-wielding maniac was busted in Midtown Manhattan Sunday morning after trying to drag his own mother by the hair to a neighborhood ATM while threatening to kill her, sources and witnesses told The Post.The deranged man, who was not immediately identified by police, was collared by cops around 8:30 a.m. on West 43rd Street between Ninth and Tenth Avenues after a dog walker saw the disturbing incident and called 911.“He had her by the back of the hair, pushing her,” witness Hannah Canerday told The Post.“She was trying to resist but I asked if everything was okay because I didn’t see that he had a knife,” Canerday explained.“Then he said ‘stop talking’ and said he was going to kill her,” she said. “Then I saw the knife when they walked past me, so I waved someone a little further down that something was going on and then I called 911.”
