A local CBS affiliate station in Chicago is reporting that an active shooting is in progress at Mercy Hospital on the South Side of the city. 'Multiple victims' have been reported. An officer is reportedly one of the victims. They are in critical condition but receiving 'excellent care' and is being transported to Northwestern hospital. The shooter, described as a white male with an assault rifle, has been killed. Police Activity: Reports of shots fired in the vicinity of 26th and Michigan near Mercy Hospital. Avoid area. Heavy police response incoming pic.twitter.com/yHe19SN8SY — Anthony Guglielmi (@AJGuglielmi) https://twitter.com/AJGuglielmi/status/1064631188088897536?ref_src=twsrc%5Etfw!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); There was an 'enormous' police response; a SWAT team unit arrived on the scene. Dozens of hospital staff gathered outside Mercy Hospital’s east entrance. At least 4 helicopters here. Enormous police response. pic.twitter.com/hVO3jYbvq9 — Sam Charles (@samjcharles) https://twitter.com/samjcharles/status/1064636483523489792?ref_src=twsrc%5Etfw!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); SWAT here https://twitter.com/Suntimes?ref_src=twsrc%5Etfw!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); pic.twitter.com/yUsetTtksH — Sam Charles (@samjcharles) https://twitter.com/samjcharles/status/1064638026297548801?ref_src=twsrc%5Etfw!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); Here's a quick rundown of what we know, courtesy of BNO News: Mercy Hospital in Chicago Started at 4:18 p.m. ET Multiple victims, including officer Possible suspect 'down' No word on motive 1 officer in critical condition Video of police streaming into the hospital is already circulating on social media. pic.twitter.com/n9FPI44LE2 — Dommi (@DLeilaniG) https://twitter.com/DLeilaniG/status/1064633506800779272?ref_src=twsrc%5Etfw!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); This is a developing story. Check back for updates...