A law firm that helped reach an $816 million settlement for first-responders to the Sept. 11 terrorist attacks has filed a lawsuit on behalf of several victims of the Aurora, Colo. theater shooting. The Denver Post reported the lawsuit filed in Arapahoe County District Court alleges gross negligence and contends Plano, Texas-based Cinemark and Town Center at Aurora failed to protect customers. Lawsuits filed against Cinemark in federal court also cite a lapse in security. Cinemark has said it couldn’t have foreseen the attack. Simon Property Group said Tuesday the shooting didn’t happen within its Town Center at Aurora mall, and its company has no involvement with the theater’s operation.