(Burns, OR)  --  The leader of a group of armed militia members says they're occupying a building at the Malheur National Wildlife Refuge in eastern Oregon to return land rights to locals.  Ammon Bundy is the son of Nevada rancher, Cliven Bundy, who's been known for his clashes with federal authorities over grazing rights.  Ammon Bundy says the group has no plans to use violence unless the government moves against them first.  While the group claims to be in support of local ranchers, the Harney County Sheriff says the group has alternative motives of overthrowing local and federal governments in hopes of sparking a nationwide movement.