State police seized a loaded gun after stopping a van Thursday on Interstate 80 near Peru. Marcus A. Cobb, 27, of Cedar Rapids, Iowa, was a passenger in a Dodge van going east when the vehicle was stopped at 1:46 a.m. for allegedly speeding. A search uncovered a small amount of marijuana, open alcohol and a .380-caliber pistol near Cobb, who gave a false name before giving his true identity. Cobb was charged with obstructing justice, unlawful use of a gun and illegal transportation of alcohol. Police did not say where Cobb was taken.