CHICAGO (CBS) — Chicago police have issued a warning of a new way some enterprising crooks have been using to rob their victims.

Police said the robbers used a prop in at least two holdups in the Fuller Park neighborhood. They set up a road construction barrel in the street, and when a motorist gets out of his or her car to move it aside, the robbers pounce.

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Motorists have been victims of the ruse twice in the past week – on Thursday in the 300 block of West 51st Street, and on Sunday in the 400 block of West 51st Street, according to a community alert from Chicago police.

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In each incident, when the motorists got out of their cars, they were beaten and robbed.

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Police said anyone with information should contact Area Central detectives at 312-747-8382.