Numerous incidents occurred on Chicago's West Side, where 25 people were injured by gunfire.
"Detectives are working around the clock to investigate the incidents, build a timeline of events and identify any shooter", said Waller. One of the victims was a 17-year-old girl who was shot in the face.
Before the particularly violent Sunday, there were six shootings, none fatal, on Friday, and 15 shootings, one fatal, on Saturday. More from ABC11: Henderson march organizers urge end to city violenceThe most recent shooting took place near the 2600 block of South State Street just before 8 p.m. However, CPD says it has seen a citywide reduction in shootings by 30 percent this year.
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The Venezuelan president said several people involved in the attempted murder had been detained. The United States on Sunday denied any involvement in the alleged "assassination" attempt .
He said in his tweet that 228 shootings and 42 homicides had been recorded in about three weeks in Chicago just between January 1 and 24, 2017. The people who were shot weren't cooperating with investigators, and the circumstances of the shooting weren't immediately known.
A witness of the shooting, 43-year-old Miguel Patino, was washing clothes with his grandmother when he saw the wounded man run up to the laundromat's door, which had been locked by an employee after shots rang out. A 37-year-old man was shot in the right calf and hospitalized in stable condition, a 21-year-old man was shot in the upper thigh and hospitalized in stable condition and another male victim was shot and is hospitalized.
"Over the past 24 hours, Stroger's trauma unit received an unusually high volume of patients", Stroger Hospital said in a statement. Police say the violence is unacceptable and they say they continue to take illegal guns off the streets. "We are asking the families of trauma patients to limit visitation at this time to immediate family members only so staff may focus on patient care".
"I promise this city that we won't be defeated, we won't be overrun by that small group, that small element that is committing these reckless acts", Waller told reporters.