A Delta plane (left) and a Southwest flight sit on the tarmac at Atlanta's Hartsfield-Jackson International Airport. Photo: 24 January 2015
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Two US airliners searched at Atlanta after bomb threats

The US authorities say bomb threats against two US airliners on Saturday were credible although no bombs were found.

It is the second time this week that airlines in America have been threatened.

On Monday, JFK airport in New York was at the centre of a similar threat involving two planes.

Kurt Volker, who's a former US Ambassador to NATO and Executive Director of the McCain Institute for International Leadership at Arizona State University spoke to BBC News.

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