Although 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 videos to surface on YouTube.

No word yet on how early the game build was, but Microsoft said it’s working with various security teams.

Here’s what Microsoft had to say on the issue:

“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.”

“This content is not from a final build and is not representative of what fans will enjoy when the game launches.”

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By Brent Butler