Video - which has not been independently verified by ITV News - appears to show gas pipes exploding in Taiwan and later captures jets of fire shooting up from the street.
After around 46 seconds on a video posted on YouTube, following an initial explosion, jets of flame begin to burst from the road.
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The talks descended into crisis on Friday when Canada's trade minister Chrystia Freeland walked out of meetings.
Police in New York are still investigating what the substance is and whether it could be harmful.
The Sherlock actor made the comment while he received an award for his humanitarian work.