Lava from an erupting volcano on Spains La Palma island has reached the Atlantic Ocean, raising fears of toxic gases being released and explosions.
Clouds of white steam were seen rising as a red-hot current made contact with the water in the Playa Nueva area. This could trigger a chemical reaction which can irritate the skin and eyes and affect breathing.
Hundreds of homes have been destroyed since the Cumbre Vieja volcano in the Canary Islands erupted on 19 September.
About 6,000 people have been evacuated, as the lava was engulfing houses, schools and some banana plantations.
BBC World News is an international pay television channel that is operated by BBC. The BBC is a public corporation of the UK government's Department for Digital, Culture, Media and Sport.