CHICAGO — Sources tell WGN that several people have been taken into custody in the fatal shooting of 24-year-old Chicago police officer Aréanah Preston, who was shot and killed outside her home in Avalon Park Saturday.

A day after the shooting incident, police reported a SWAT incident in the 7600 block of South Bishop Avenue around 8:25 p.m. Sunday night. Police cleared the scene early Monday morning.

Police have not identified why the SWAT situation took place.

Meanwhile, multiple individuals were taken into custody near the corner of 77th Street and Bishop Avenue early Monday morning, a source told WGN.

According to police, Preston had just returned home from her shift when she was shot in the 8100 block of South Blackstone Avenue at around 1:42 a.m.

Originally reported as being off-duty at the time of the shooting, Chicago police later ruled that Preston was on-duty at the time of the incident because she took “police action.”

A vigil is planned in Preston’s honor at CPD’s 5th District police station Tuesday.

WGN is actively following this incident and will update as more information is recovered.