Visitors and the general public are being asked to stay away from Adventureland Park and Prairie Meadows Casino this (Friday) morning, due to what Altoona Police are calling an “Active situation.” KCCI-TV in Des Moines reports multiple police units have staged in the area of spectators and the Adventureland camp grounds. Prairie Meadows was under lock-down. A Police Sgt. said people need to stay away, but they provided no other details.