Police arrested a man in connection with the mass shooting at a South Philadelphia bar on the July 4 weekend that injured eight people.

Michael Welton, 43, was charged with attempted murder, aggravated assault, possessing an instrument of crime, and recklessly endangering another person, Philadelphia police said in a release Friday night.

Eight people were shot at the 7 Elements restaurant, bar and lounge on 11th Street and Washington Avenue on July 5. All victims are now in stable condition.

Authorities said Welton turned himself in to police and he was working as a security guard at the time of the shooting.

Preliminary investigation reveals that an argument outside the bar escalated into a fight involving knives, police said.

The release states shots were fired on the balcony as the security guard attempted to intervene, which caused people to flee. The security guard also admitted to firing a gun, police said.

Police believe the motive for the shooting stems from the initial argument that escalated.

This shooting remains an active and ongoing investigation.