Can the statute of limitations be tolled because the government knew of the negligence of the rangers?

Appellants imply that the statute should be tolled because the Government knew of the negligence of the rangers and did not come forward with that information. If the Government has been negligent, it has no general duty to announce that fact to the world at large. There are no grounds for tolling the statute of limitations based simply on the Government's knowledge of its own wrongdoing absent fraudulent concealment, or other forms of conduct that may be recognized as grounds for equitable tolling of the statute. Borzeka v. Heckler, 739 F.2d 444, 448 n.3 (9th Cir. 1984). No sufficient grounds for tolling the statute have been asserted here.