Saudi people walk through a sand and dust storm in Riyadh on 10 March 2009. Photograph: AFP/Getty ImagesThe sandstorm envelopes the Saudi capital, Riyadh, a city with four million inhabitants.Photograph: AFP/Getty ImagesOn the road in Riyadh. The storm has caused traffic problems in the city. Photograph: Hassan Ammar/AP
Sandstorms occur when strong winds hit desert areas, whipping up the top layer of sand. As the sand particles collide, they move erratically and reduce visibility as well as causing damage to crops and machinery. Photograph: AFP/Getty ImagesPeople with respiratory problems and children have been warned to stay indoors.Photograph: AFP/Getty ImagesThe storm, which was still raging hours after it started, disrupted flights at the city's King Khalid International airport, with weather authorities announcing that visibility would drop to zero.Photograph: Jad Saab/APDate trees ravaged by the sandstorm. Photograph: Hassan Ammar/APThe storm was caused by high pressure in the northern and central parts of the Saudi kingdom and is expected to end shortly. Photograph: Jad Saab/APA Saudi man covers his face with a traditional Saudi head dress cover as people try to protect themselves from the ravages of the sand and dust being carried on the strong wind.Photograph: Hassan Ammar/APView of a skyscraper obstructed by sand and dust in Riyadh. Photograph: Jad Saab/AP
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