Investigators said a man held a mail carrier at gunpoint about 2:45 p.m. on Oct. 13. It happened at the intersection of 212th Place and Main Street.
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The man is described as being in his early 20s; having a medium-dark skin tone; wearing a black ski mask, black sweatshirt and red jogging pants; and carrying a black or blue gym bag over his shoulder.
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He fled on foot south on Main Street after the incident, officials said.
The suspect is considered armed and dangerous.
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Anyone with information is asked to contact the U.S. Postal Inspection Service at 1-877-876-2455.
Several postal workers in the Chicago area have been robbed in recent weeks, many for their special keys that allow access to large mailboxes.