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Pyongyang spokesperson Ri Yong Ho blamed the “hostile policy” of the US for escalating tensions in the region – which Mr Ri described as “the world's most dangerous hot spot”.

The B-1B bombers flew through South Korean airspace, with US officials later confirming that one approached the northern border.

Northern officials believe that the supersonic bomber crossed the line of demarcation designed to create distance between the warring north and south.