The United Nations believes it has solved the mystery of why an escalator abruptly stopped shortly after U.S. President Donald Trump stepped onto it on Tuesday - his videographer may have accidentally triggered a safety mechanism.

NEW YORK CITY, NEW YORK: The United Nations solved the mystery behind the abrupt stopping of an escalator on Tuesday, September 23, at the UN General Assembly, the moment President Donald Trump and first lady Melania stepped on it.

The malfunction occurred on the president's way to give an address at the United Nations' General Assembly in New York City and was just one of the technological malfunctions that interrupted Trump's schedule.

During his speech, he renewed his feud with London Mayor Sir Sadiq Khan, calling him a 'terrible, terrible mayor', as well as attacking UN assistance for asylum seekers, saying the organisation was 'funding an assault on western countries and their borders'.

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US President Donald Trump opened his speech at the United Nations General Assembly in New York with a jab at the global body. He joked that 'a bad teleprompter and a bad escalator' were all he got from the UN before turning serious,