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Today, at lunchtime 12.15 pm, one of the strongest sandstorms in decades hit the Saudi capital Riyadh.
It was filmed by a BBC viewer, Matthew Thomson.
Mr Thomson, who filmed this from his office on the 56th floor of Kingdom Centre, said the storm took around 10 minutes to pass over the city and reach his building.
He said: "In a matter of 30 seconds or so, visibility dropped from miles to just a few metres completely obscuring the view to the street below."