Chicago police have responded to what is being described as an active shooting at Mercy Hospital on the city's South Side. An officer was wounded. Multiple victims are reported.

Police said shots were fired both inside and outside the hospital between 3 p.m. and 3:30 p.m.

Chicago police have not released any further details about the condition of the wounded, including the officer.

Witnesses who spoke to ABC7 Chicago outside the hospital said they heard a flurry of gunshots, as many as 10 to 20, causing them to duck beneath cars and hide.