Calbuco volcano, Chile
Twin blasts from the Calbuco volcano in southern Chile sent vast clouds of ash into the sky, increasing concerns the dust could poison water, cause breathing illnesses and ground more flights.
The volcano erupted on Wednesday afternoon last week for the first time in more than four decades, spewing out a plume of ash more than 10 kilometres high. Emergency officials were taken by surprise and had only a few minutes to issue an alert.
Calbuco had a second spectacular outburst early on Thursday with lightning crackling through a dark sky turned reddish orange by the explosion.
No injuries were reported and the only person reported missing since the eruption was found on Thursday.