Facebook's $1bn acquisition of photo-sharing service Instagram is reportedly facing delays of several months, as US regulators probe the deal.
According to the Financial Times, two people familiar with the matter have confirmed that the Federal Trade Commission has launched an investigation into the purchase, because of the eye-popping price paid by the social networking maven.
That investigation could last up to 12 months, meaning Facebook cannot close the deal in the timeframe outlined in its initial public offering (IPO) prospectus.
Facebook originally announced its intention to buy Instagram in early April, with many market watchers expressing surprise at the price. It subsequently emerged that the deal had been largely brokered by Facebook founder and chief executive Mark Zuckerberg, without input from the company's management board.
But according to the FT, the major threat facing Facebook is not that the deal will be blocked by US competition regulators, which is seen as unlikely, but that it will disrupt Facebook's mobile strategy.
Instagram has proved to be a massive hit with smartphone users, a market where Facebook is desperate to expand.
The news could not come at a more delicate time for Facebook, which is due to launch its IPO in the coming weeks.
Facebook had not responded to a request for comment at the time of publication.
British Airways blames 'global systems outage' for IT meltdown
Mark Zuckerberg mercilessly trolled by Harvard student newspaper after return to university he dropped out of 12 years ago
'Unauthorised user' blamed by Harvard for insulting Mark Zoinkerberg
Android under attack from 'Judy', Google Play Store malware that has infected up to 36.5 million users
Yet more Android malware discovered on the Google Play Store
Airport believes new system will be more reliable than GPS or Google Maps