An employee for the Sonic Drive-in at 2201 S. Broadway closed shop late Saturday night, and as he was walking to his car, was robbed of the store's bank bags.
The incident happened shortly after 11 p.m.
"The suspect knocked him down and took the bank bags and fled southbound from the scene," said Sgt. Steve Yarberry, spokesman for the Wichita Police Department.
An undisclosed amount of cash was taken.
No injuries were reported, Yarberry said.