Authorities in southern Chile and Argentina are continuing to monitor the direction of ash clouds belched out by a chain of volcanoes over the weekend.

Some 3,500 people left the region after the eruption of the Puyehue-Cordon-Caulle volcano range, about 800km (500 miles) south of the capital, Santiago.

Wind carried ash across the Andes, dropping a grey blanket on the Argentine resort of of Bariloche.

A change of direction then sent ash back to the Chilean side.

San Carlos de Bariloche, about 100km (62 miles) east of the volcano, remains on alert.

Authorities said classes and other public activities were cancelled, and flights were likely to remain suspended until mid-week.

The health ministry has also sent face masks and eye drops to the region, local media reported.

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