Southern Chile's Puyehue volcano erupted on Saturday for the first time in half a century prompting evacuation orders for 3,500 people and turning into dark the Argentine Patagonian resort of San Carlos de Bariloche, 100 kilometres to the east as it was covered with ash.
Thousands of passengers are facing long delays after airports in Scotland and Ireland closed because of a fresh cloud of volcanic ash from Iceland. Flights have been grounded in Glasgow, Prestwick and Derry since 0700 BST, while the airspace over Dublin, Belfast and Edinburgh has also since closed.
Airlines may not have seen the last of the ash cloud crisis, experts said on Sunday. The impact of ash on aircraft air-conditioning systems could be serious, warned aviation lecturer Stephen Wright of Leeds University.