Activision also said they believed anywhere between 4.5-5 million units were sold in the two nations, given a boost in the UK by a price drop in many supermarkets.
"The Call of Duty franchise has become a cultural phenomenon showing the power of video games as an entertainment medium," adds Mike Griffith, CEO of Activision Publishing. "The shattering of these entertainment records is a testament to the compelling, cinematic and uniquely engaging experience that the Call of Duty brand delivers. Modern Warfare 2 has taken interactive experience to unprecedented heights setting a new standard for entertainment."
Chart-Track reported earlier that the game had sold 1.23 million units in the UK alone.