Another triple shooting occurred around the same time in the South Austin neighborhood to the northwest. Officers placed evidence markers around a vehicle that had been damaged by the gunfire in the 5500 block of West Lake Street. A woman, pushing a stroller, walked past the crime scene and through police tape.



A woman, who did not want to be identified but is nicknamed the "Sheet Lady," was visiting friends near where the shooting took place. She huddled at the edge of the crime scene on Lake and voiced her frustration with gun violence. She said she was wounded in a shooting about two years ago in Maywood.



"We out here helpless," she said.



Before Monday, only 28 people had been shot over the previous three nights, a low total for any weekend in Chicago.



This year, 1,300 extra officers were deployed during the weekend on top of normal staffing levels, according to police Superintendent Eddie Johnson. Last year, there were about 880 extra officers working, he said.



The officers worked in areas where much of the city violence occurs. The Chicago Police Department parked a mobile command center on one of the city's most widely known open-air heroin markets, at Roosevelt Road and Independence Boulevard, for the first two nights of the weekend.



The RV-size command van moved to an area near 63rd Street and King Drive after the second night. Nineteen of the 28 people shot the first three nights were wounded on the South Side, while the West Side saw just five shootings with a total of eight victims the first three nights.



One person over that period was wounded in a Northwest Side shooting, at Addison Street and Keeler Avenue.



The Cook County sheriff's office parked its mobile command center on a block widely known as one of the city's busiest marijuana spots -- Madison Street and Leamington Avenue -- where there have been close to a dozen shootings over the last 18 months.



It was common to see officers three or four to a car, or officers riding around in rented vans. Evidence techs also were moved into rental cars before the weekend. Many officers' days off were canceled and hours extended.



As the weekend drew to a close Tuesday morning, someone in a passing car fired toward a group standing outside Mount Sinai Hospital, police said.



An evidence tech at the hospital alerted his dispatcher that a car was shooting as nearby officers called out the sound of gunfire near the hospital.



Six of the 24 people shot between Monday and Tuesday mornings had been taken to the West Side trauma center for treatment. No one had been taken into custody for those shootings.



Outside the hospital a few minutes after the shooting, officers surrounded a group of people who were arguing. Shortly afterward, two cars filled with people left the hospital while others walked toward Douglas Park.



Police at the scene said no one was hit by the gunfire.