The Citgo at 1002 of South Jackson Street in Janesville was robbed early this morning. The suspect, 47-year-old Maureen Martin of Janesville came in demanded money and fled in a pick-up truck. The store clerk was watching her every move and gave police license plate information. The detailed description went out and a Rock County Deputy chased martin in a car and by foot. Martin is now in the Rock County jail with armed robbery charges and possession of crack cocaine.