An employee at an Illinois Subway restaurant stopped a robbery by throwing a pot of soup at an armed robber wearing a ghost mask, police said.

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The attempted robbery happened at 6:45 p.m. Friday when an employee was leaving the restaurant and was forced back inside by the masked bandit, the Chicago Sun-Times reported.

"He pushed her down to the floor and kept yelling to open the register," said Braidwood Police Chief Rich Girot. "A male employee threw a pot of soup at the suspect and they scuffled until [the robber] ran out to a black compact car."

Neither of the employees was injured, but the woman was "shaken up" and taken to a hospital for examination, Girot said.

Girot said police were reviewing footage from security cameras.