Chicago police car hit by gunfire on South Side near Chicago State University

CHICAGO (CBS)-- Gunfire hit a Chicago police car on the South Side near Chicago State University early Monday morning. 

Police said officers were driving in the 9400 block of Cottage Grove Avenue just before 3 a.m. when shots were fired. The back window of the marked police vehicle was shattered. 

Police said officers were not injured and did not return fire. 

No arrests have been made.