A huge portion of a glacier in the Swiss Alps has broken off from the mountainside, sending rock, mud and ice crashing onto the village of Blatten. Authorities have been warning of a potential collapse of the Birch glacier for weeks now as cracks appeared in the ice. Earlier this month, villagers and livestock were evacuated from Blatten, which sits in the valley below the glacier and is home to around 300 people. Webcam and drone images from 28 May show enormous plumes of dust billowing into the Alpine valley as the glacier collapsed, with a huge wave of mud...