Around 10:35 p.m., several males ambushed a woman on the 4400 block of North Wolcott Avenue, near Wolcott and Montrose.
An unspecified number of offenders approached the woman from behind, shoved a hard object in her back, and demanded her valuables, said police.
Investigators said the victim did not see the robbers’ faces, but based on their voices, the victim believes the offenders are black.
The thieves stole the woman’s purse and a backpack containing a laptop, said authorities.
The victim was unable to tell police which way the suspects fled, because she was forced to lie on the ground and count while the thieves made their getaway, said a responding officer.
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