The US Federal Trade Commission on Thursday sued to block Microsoft's $69 billion buyout of gaming giant Activision Blizzard, maker of the blockbuster "Call of Duty" title, over concerns that it would stifle competition.
The lawsuit marks one of the biggest ever interventions by the US government to stop consolidation in the tech industry and raises significant doubts on the future of the transaction.
"Today we seek to stop Microsoft from gaining control over a leading independent game studio and using it to harm competition in multiple dynamic and fast-growing gaming markets," said Holly Vedova, director of the FTC's Bureau of Competition.
The move by Washington follows an intervention by the European Union, which opened an in-depth probe into the transaction over its concerns that the deal would see Activision Blizzard's popular games become exclusive to Microsoft, the maker of the Xbox console.
Britain has also announced an "in-depth investigation" into Microsoft's planned takeover of Activision, which also produces mobile game "Candy Crush."
In January, Microsoft -- which also makes its own games to be played on PCs and mobile devices -- announced the takeover that would create the world's third-biggest gaming company by revenue.
The FTC said Microsoft had a proven history of buying up smaller gaming companies only to make the games exclusive to Microsoft -- and thus inaccessible to rivals such as Nintendo or Sony.
Microsoft had earlier this week made moves to satisfy concerns by announcing that it would bring the "Call of Duty" franchise to Nintendo Switch, a rival of Xbox. This followed an earlier decision to make "Call of Duty" available on Sony's PlayStation.
"We continue to believe that this deal will expand competition and create more opportunities for gamers and game developers," said Microsoft President Brad Smith in a statement.
"While we believe in giving peace a chance, we have complete confidence in our case and welcome the opportunity to present our case in court."
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