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QUITO, Ecuador (AP) - A cloud of ash that climbed more than 2.5-mile-high (4-kilometer) from Tungurahua volcano on Monday has affected a third of Ecuador's provinces and forced the suspension of classes at some schools after temporarily closing a regional airport.
A series of 10 powerful cannon-like blasts shook the 16,480-foot (5,023-meter) volcano overnight and could be heard for miles. Tungurahua is nearly 90 miles (140 kilometers) south of Quito.
Fernanda Naranjo of Ecuador's geophysics institute said there have been no pyroclastic flow _ fast-moving, super-hot fluidized masses of rock fragments and gases_ since Saturday.
One such flow halted less than a mile from a highway, according to a bulletin posted on the institute's website. But none has reached villages, where residents have been evacuating their homes during the nighttime, then returning during the day. The volcano resumed erupting late last week after being quiet since October.
In Monday's bulletin, the institute said it is likely that Tungurahua will continue to experience explosions and produce small and moderate pyroclastic flows. It also said continued adverse health effects and more disruptions of air travel were possible.
On Sunday, ash from Tungurahua forced the closure for several hours Sunday of the Mariscal Lamar airport in Cuenca, Ecuador's third-largest city.
The government called for voluntary evacuations of hundreds of people living near Tungurahua, officials distributed masks to protect them against the inhalation of ash.
Tungurahua has been erupting sporadically since 1999. In 2006, a pyroclastic cloud killed four people and left two missing.
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Associated Press writer Frank Bajak contributed from Lima, Peru.
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