According to court documents obtained by TMZ, the Heart Attack singer is facing assault charges for allegedly repeatedly punching a woman at a NYC bowling alley and dragging her by her hair. An employee of the bowling alley accused the 37-year-old R&B star of having attacked her last month in the venue's bathrooms. Documents indicate she was later taken to hospital to be treated for her visible injuries. Authorities have not commented on possible motives behind the alleged attack. Songz's attorney, Mitchell Schuster, maintained in a statement his client was innocent.