(Reuters) - North Korea intensified threats of an imminent conflict against the United States and the South on Tuesday, warning foreigners to evacuateSouth Korea to avoid being dragged into “thermonuclear war”.

The North’s latest message belied an atmosphere free of anxiety in the South Korean capital, where the city center was bustling with traffic and offices operated normally.

Pyongyang has shown no sign of preparing its 1.2 million-strong army for war, indicating the threat could be aimed partly at bolstering Kim Jong-un, 30, the third in his family to lead the country.

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