Police said the shooting occurred at an outdoor birthday party for a one-year-old.
Skinner said the children were not the targets of the shooting.
"There was a birthday party going on for a one-year-old at the time", Supt.
Gunshots rang out in the area of Tandridge Crescent and Byng Avenue shortly before 8 p.m. and emergency crews arrived on scene to find four victims, including a one-year-old child, a five-year-old girl, an 11-year-old boy, and a 23-year-old man, suffering from gunshot wounds.
A one-year-old boy.
Taverner would not say how many suspects police are looking for but investigators believe the perpetrators fled southbound on foot and took off in a waiting vehicle.
While the police did not elaborate on the condition of the injured people, local media outlet City News reported that one child was in a life-threatening condition, another had serious injuries, along with the adult male.
However, it's believed the baby was grazed and was being treated by paramedics at the scene but was expected to be transported to Sick Kids hospital where the other two children were being treated.
Paramedics had previously said five people were wounded, but police say the number is actually four. Per CTV, Taverner said that while the investigation is in its early stages, "it doesn't look like any of the people that were shot were particularly targeted".
Taverner said a vehicle was seen speeding away from the scene.
A police source speaking to CP24 Sunday said that a warrant has been obtained to search a residence on Tandridge Crescent.
"I know we all want answers to why this tragedy happened and to see those responsible face justice", Tory said.
Premier Doug Ford called the shooting "inconceivable and beyond comprehension", adding the "perpetrators must be found and brought to justice".
Ford encouraged those who may have witnessed the incident to contact police.
Mayor John Tory issued a statement Sunday morning saying firing a gun in Toronto is unacceptable "anywhere anytime", but "doing so at a child's birthday party goes way beyond that".
As of Sunday morning, there was no update on the condition of the other victims.
Kirsty Duncan, the federal member of parliament representing the riding where the shooting took place, said she was "horrified" by the incident in her community.