WILLIS, TX --Authorities are searching for a possibly armed man accused in two aggravated robberies in Willis over the weekend. Carlis Morgan Mathis is wanted on a warrant for aggravated robbery with a $100,000 bond, according to a Willis Police Department statement. On Friday, Mathis is accused of robbing a grocery store clerk at gunpoint. Two days later, he robbed a gas station clerk also at gunpoint. Anyone with information regarding Mathis' whereabouts is asked to contact the Willis Police Department at 936-856-4039 or Crime Stoppers at 713-222-8477.