Two men were stabbed in Center City. A group of bystanders tried to defend them.

Two men were stabbed following an altercation with a man armed with a sharp object in Center City Sunday night.

The Philadelphia Police Department responded to a radio call for a person with a weapon at 15th Street and John F. Kennedy Boulevard at around 9:07 p.m.

Officers were met with witnesses who reported that a verbal dispute between two men escalated into a physical altercation, police said. Witnesses said the suspect struck a 50-year-old man several times in the back of the head during the incident.

As the fight continued between the suspect and the 50-year-old man, up to 12 unidentified people jumped into the altercation, allegedly punching and kicking the suspect until he fell to the ground, police said. A second person, a 37-year-old man, was cut on his left arm during this scuffle.

Both injured men were transported to Thomas Jefferson University Hospital for treatment.

The suspect was last seen fleeing southbound on 15th Street.