A man's car was stolen outside a gas station in Mascoutah on Sunday when he left the car running and went inside, police say.
The man went inside the Casey's General Store about 11:35 a.m., leaving his car running in the parking lot of 705 North Jefferson Street.
A person then got into the car and drove away after being confronted by the car's owner, according to Mascoutah Police.
The car, a black 2006 Nissan Altima with Illinois plates P82 6886, was last seen southbound on Illinois 4.
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The suspect was described as a white man, approximately 45 to 55 years old, with shoulder length hair and wearing a blue hat, police said.