The eagerly awaited blockbuster computer game, Doom 3, has been leaked on the internet.
Copies of the game on file-sharing networks and newsgroups are being downloaded by thousands of people.
The cost to the game's makers, id Software, could run into hundreds of thousands of pounds in lost sales.
The sci-fi horror title has been four years in the making and is due to go on sale in the US on Tuesday and next week in the UK.
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