"For now, the ash fall is mild," Ecuador's National Secretariat for Risk Management said on its Twitter account. It called activity at the volcano, which is 130 kilometres south of the capital Quito, "moderate to high."
But it admitted that "it is difficult to predict future behavior."
The Tungurahua volcano, which in the Quechua language means "throat of fire," expelled an impressive plume of ash and smoke yesterday, putting authorities and villagers on alert.
Visitors and locals in Banos, a tourist town on the slopes of the volcano, went about their business as usual and shops stayed open.
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Multiple villages are located in the vicinity of the volcano, which stands at 5,029 metres in central Ecuador.
In 2006, six people died in a village destroyed by lava from Tungurahua.
Tungurahua, which has been erupting since 1999, is one of eight active volcanoes in Ecuador, a country that is part of the so-called Pacific Ring of Fire that makes it prone to seismic and volcanic events.