(WBBM NEWSRADIO) -- Chicago police are investigating another round of robberies targeting U.S. postal workers.
Investigators say two men robbed three mail carriers at gunpoint over six days.
The first robbery happened March 2 in the 1400 block of South Halsted. Then, on March 7, armed robbers struck again in the 100 block of South Leavitt and shortly after in the 7900 block of S. La Salle.
Chicago police say in each robbery, masked suspects approached the mail carriers on the street and demanded their U.S. postal keys at gunpoint, and after getting them, ran away.
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