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

Trump jokingly complained about the incident during his speech to world leaders earlier on Tuesday after the teleprompter also didn't work.

“These are the two things I got from the ited Nations - a bad escalator and a bad teleprompter," he told the 193-member assembly, to some laughter.

"These are the two things I got from the United Nations - a bad escalator and a bad teleprompter," he told the 193-member assembly, to some laughter.

White House Raises Concerns

However, White House Press Secretary Karoline Leavitt wasn't so lighthearted about it.

"If someone

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