(Hinckley, MN)  --  A police standoff at Grand Casino Hinckley ended peacefully this morning after a man threatened an officer with a gun.  Pine County authorities received a call that a semi was driving carelessly through the casino's R-V park.  The first officer on the scene was threatened by the driver with a long gun and emergency back-up teams were called in.  A standoff in the parking lot ensued for several hours before the driver surrendered and was taken into custody.