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

U.N. spokesperson Stephane Dujarric said a readout of the escalator’s central processing unit indicated it “had stopped after a built-in safety mechanism on the comb step was triggered at the top of the escalator.”

He said Trump’s videographer had been traveling backwards up the escalator to capture his arrival with First Lady Melania Trump.