Shares of Amazon.com (NASDAQ: AMZN) slid 3% through 12:30 p.m. ET on Tuesday after Reuters -- in an exclusive report -- warned that British regulators may launch an antimonopoly investigation into the company's dominance of the cloud computing marketplacej.  

(NASDAQ: MSFT) -- also reported to be part of the probe -- saw its shares slide a similar 2.5%.

As Reuters reports, the British media regulator "Ofcom" (short for the Office of Communications) has actually been looking into Amazon's and Microsoft's dominance in cloud computing since April -- but is now preparing to issue an official report on Thursday.

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Source Fool.com