CHICAGO (MCT)— A Postal Service mail carrier was shot Tuesday evening after a dispute over delivering the mail "too late" on Chicago's Far South Side, authorities said.

Denny Robinson, 31, who was shot in the right thigh, was taken to Advocate Christ Medical Center in Oak Lawn, Ill., where he was being treated for non-life-threatening injuries, according to a nursing supervisor at the hospital.

Robinson was delivering mail in his pushcart when the shooting occurred about 6:30 p.m. in the 100 block of West 118th Street, police said.

Preliminary reports indicate a witness "heard someone yelling at him for delivering the mail too late," said Chicago Police Capt. Ruth Wedster.

"A couple of minutes later, (the witness) heard a shot."