ST. LOUIS (AP) — The mayor of the St. Louis County town of Pine Lawn has pleaded not guilty to federal extortion charges. Fifty-four-year-old Sylvester Caldwell entered was arrested Thursday and accused of demanding bribes from a towing company in exchange for city business. An indictment says Caldwell accepted five payments totaling $1,600 between December 2013 and April, in exchange for ordering the Pine Lawn police force to use the company's services.