Halo: Reach, Bungie’s highly anticipated prequel to the Halo series, has been leaked online. The full game was uploaded to a restricted area at Xbox.com by Microsoft for press review purposes. However, hackers managed to bypass the site’s security measures and have now made the game publicly available.

While Microsoft is “aggressively investigating” the matter, Bungie recommends that Halo fans avoid sites and forums that might host spoilers.

It’s a case of déjà vu for Microsoft and Bungie as both Halo 2 and Halo 3 were leaked online and shared by pirates prior to official release.

The legitimate version of Halo: Reach will be on New Zealand shelves on September the 14th.