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CHAMPAIGN — Police are investigating an armed robbery early Tuesday morning on Champaign’s south side.

According to a police report, about 9:50 p.m. Monday, a 21-year-old Champaign man invited a man to his apartment in the 1000 block of South First Street for a drug sale.

Three other men arrived instead, displayed a gun and took the victim’s backpack, book, cellphone, cash, video-game system and illegal drugs.

No injuries were reported.