CHICAGO (CBS)– Seven people were shot in Lincoln Park near Fullerton Beach early Saturday morning.

At least three adult victims were taken to Illinois Masonic Hospital in critical condition, according to the Chicago Fire Department. The seventh victim self transported to a local hospital.

READ MORE: Police Warn Of Armed Robberies And Carjackings In Lakeview And Lincoln Park

Officers arrived at Fullerton and Lake Shore Drive to find six victims just after 3 a.m.

Evidence technicians found multiple shell casings at the scene just steps from the Theater on the Lake.

Police said the shooting began as an argument between two groups. One group was leaving the lake front and another was arriving when words were exchanged.

READ MORE: Jury Begins Deliberations In Jussie Smollett Trial After Closing Arguments Conclude

Police said a person in each group started shooting.

Police have license plate reader cameras along the lake front, but a suspect has not yet been identified.

This shooting was just one of several shootings that happened overnight across the city. Nineteen people were shot and two killed.

MORE NEWS: Chicago Weather: Turning Cloudy Wednesday Night

This is a developing story.