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Mexico's erupting Popocatepetl volcano has been spewing large clouds of ash and vapour into the sky. The volcano is located 80 km to the southeast of Mexico City. The alert level for the volcano was raised to yellow phase three on July 6. It is the third-highest caution on the seven-step scale, which warns that a change in activity of the volcano could provoke big explosions capable of sending incandescent fragments out over considerable distances. The Mexican authorities are keeping a close watch over the volcano which is surrounded by about 50,000 residents.
