Tens of thousands of Pyongyang residents were gathered in the capital's Kim Il-Sung Square Saturday to laud leader Kim Jong-un's denunciation of US President Donald Trump.

Such set-piece rallies, organised by the authorities, are a regular feature of political life in Pyongyang, and are intended as a physical demonstration of popular support for the leadership.

Students in white shirts and red ties held up the red flag of the ruling Workers' Party, with a yellow ink brush representing intellectuals, a hammer for the workers, and a sickle for the peasantry.

Ranks of workers and residents listened, their fists clenched, as speakers repeated Mr Kim's denigration of Mr Trump as "mentally deranged" and a "dotard".

The US president dubbed Mr Kim "Rocket Man" in a speech at the United Nations last week in which he threatened to "totally destroy" the North if it attacked the US or its allies.