Though Gears of War 3 isn't scheduled to ship until September, an early build of the game's single-player campaign has leaked to the Internet, causing a flood of spoiler-filled videos to surface on YouTube.
No word yet on how this early build was obtained, but Microsoft said it's working with various security teams.
"We have seen the reports of Gears of War 3 content being propped on the Web and working closely with our security teams and law enforcement to address the situation," Microsoft said in a statement given to IGN.
"This content is not from a final build and is not representative of what fans will enjoy when the game launches."
Microsoft's major release last September, Halo: Reach, was also leaked to the web a few months early.
Source: IGN