By Al Novack, Jim Melwert, Nicole Brewer

PHILADELPHIA (CBS) – Four people were stabbed during an altercation inside a bar across the street from Love Park in Center City.

The incident happened at about 1:30 a.m. Tuesday morning.

Police say an argument and fight began inside Big Bang’s Bar and Grille at 15th and Arch Streets. According to police, three customers were stabbed in the back and a bouncer was stabbed in the hand.

Police commissioner Charles Ramsey says they don’t know what started the altercation, “Probably an argument of some kind, some nonsense, nothing worth stabbing anyone over, I can almost guarantee you that.”

Police say after the victims were stabbed, those responsible fled on foot and remain at large.

All four of the stabbing victims are hospitalized with non-life-threatening stab wounds and are listed in stable condition.