Peruvian glacier triggers Andes tsunami

<p><br /> A huge glacier has broken off and plunged into a lake in Peru, triggering a 23-metre tsunami.<br /> </p><p><br /> The wave swept at least three people away and destroyed a water processing plant serving 60,000 residents in and around the town of Carhuaz.<br /> </p><p><br /> The ice block tumbled into a lake in the Andes 200 miles north of the capital Lima.<br /> </p><p><br /> Investigators said the chunk of ice from the Hualcan glacier measured 500 metres by 200 metres.<br /> </p><p><br /> The breakage is one of the most concrete signs yet that glaciers are disappearing in Peru, which is home to 70 per cent of the world's tropical icefields.<br /> </p><p><br /> Scientists say warmer temperatures will cause them to melt away altogether within 20 years.<br /> </p>