Entertainers have been putting their elaborate costumes on show at Notting Hill Carnival for a second day.
More than a million people are reported to have turned out to watch them parade through the streets of west London.
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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.