The company argues in lawsuits filed Friday in Nevada and California that it has "no liability of any kind" to survivors or families of slain victims under a federal law enacted after the Sept. 11 terrorist attacks.
The lawsuits target victims who have sued the company and voluntarily dismissed their claims or have threatened to sue after a gunman shattered the windows of his Mandalay Bay suite and fired on a crowd gathered below for a country music festival.
High-stakes gambler Stephen Paddock killed 58 people and injured hundreds more last year before killing himself. Victims with active lawsuits against MGM don't face the company's legal claim.