A Boston man has been charged with raping a 17-year-old during the booze-soaked Keith Urban concert last weekend that resulted in 50 arrests and 46 people treated for alcohol-related illnesses, 22 of whom were sent to a local hospitals.

One of those arrests was Sean Murphy, 18, of Boston. According to The Sun Chronicle, Murphy is accused of raping a 17-year-old girl he met at the concert. Onlookers allegedly captured the incident on their cell phones, but no one actually intervened until an off-duty Peabody police officer noticed the commotion. The officer asked the girl if the act was consensual and, when told it was not, pulled Murphy off of her, according to the report. Murphy was arrested shortly afterward.

On Monday, Murphy pleaded not guilty to forcible rape. His lawyer told the Sun Chronicle the sex was consensual. Police believe both Murphy and the girl were drinking.