SPRINGFIELD (AP) - Springfield's mayor is blaming gang activity and the businesses that attract gang members for weekend gun violence that left five people with serious but non-life threatening injuries.

Police say at least one person was shot outside Lux Nightclub early Sunday morning, while one person was shot outside Baystate Medical Center. Police are still trying to figure out where three other victims were shot. The shootings are all thought to be connected.

The investigation is being thwarted because victims have been uncooperative.

Mayor Dominic Sarno pledged to crack down on clubs that draw unruly crowds.

Sherwood Jarrett, the owner on Lux, tells The Republican he tries to run a respectable establishment and follows all city rules, including the hiring of police details. He says blaming his business is too easy.