Fears are growing that Hawaii's Kilauea volcano is heading for a major eruption. The US Geological Survey has raised the alert from orange to red, meaning that a major volcanic eruption is imminent or very likely. The volcano is one of the world's most active, and its activity level has increased substantially over the past twelve days. A 300m-long fissure has opened on the volcano's side, releasing more lava and gas and sending a plume of ash and smoke as high as 12,000 feet. There were reports of ash and vog (volcanic air pollution) falling as far as 18 miles downwind, the USGS said. Dozens of homes and swathes of farmland in that area have been destroyed. US president Donald Trump declared it to be a disaster on Friday, following a request from Hawaii's governor, David Ige.