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Activision isn't spilling any details on Modern Warfare, but rumour of the sequel hitting back in March 2006 suggested it deals with tackling terrorists around the globe in an attempt to thwart plans that involve unleashing an arsenal of chemical weapons.
Players, according to the rumour, will operate as part of the S.A.S., US Marines and the US Army, with the action occurring in such locations as the Middle-East, the streets of Eastern Europe, aboard sea vessels in the North Atlantic and London.

Lending credence to this info is the fact that it was accompanied at the time by rumoured details on Call of Duty 3, which turned out to be pretty much spot on.

All will be revealed soon...

Visit the COD 4 (Charlie Oscar Delta) site here