Several people have been taken hostage by armed youths at state television headquarters in the capital of Democratic Republic of Congo, according to AFP.
Before the station's television feed was shut down, two presenters were seen on screen, under threat from a young man standing behind them.
Police spokesman colonel Mwana Mputu told the news agency: "They are armed with machetes and guns. They have taken reporters hostage. An operation is under way to dislodge them,"
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Guillier conceded a "severe defeat" defeat to his supporters as the result came in.
The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.