Commuters at a PATCO station in Center City Philadelphia are reporting on Friday a disturbance due to large crowds.
The transit agency issued a warning to riders about crowds at the 8th and Market Streets Station, advising riders to use other stations if possible.
The disturbance may have been caused, in part, by a Zac Brown Band concert at the BB&T Pavilion in Camden, New Jersey.
Many commuters took to Twitter to complain about public urination, drunk riders with coolers, riders vomiting, harassment and a lack of police presence.
PATCO said it was addressing the issue.
At 5:33 p.m., the transit agency reports the crowd at 8th and Market streets has dissipated.