Pablo Cozzaglio / AFP - Getty Images

Authorities near Penipe, Ecuador upgraded a possible eruption warning from yellow to orange on Nov. 28, 2011, as the activity of the Tungurahua volcano raised suddenly.

Tungurahua volcano heats up in Ecuador

Associated Press reports

Ecuador's government is urging four villages to evacuate because of increased activity in the Tungurahua volcano not far from the country's capital.

Ecuador's Geophysical Institute says increased activity that began Sunday is billowing columns of ash, sending superheated clouds of gas down the slopes and cascading hot rocks from the summit.

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