By CBS 2 Chicago Staff

CHICAGO (CBS)– A string of robberies on CTA trains and platforms has prompted a police alert.

Police said the offenders walk up to the victims, pull out a gun and take their property.

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Two robberies were reported at the Halsted Green Line station, hours apart on Oct. 24.

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The other two incidents were reported at the 69th Street Red Line station on Nov. 5 and 8.

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CBS 2 Chicago Staff