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Iceland raised its aviation alert over the nation's largest volcano to red on Friday, after the Bardarbunga peak began erupting overnight. A ban on air traffic around the country's largest volcanic system was also put in place, but the authorities said there were no signs of spewing ash. A major explosion at Bardarbunga, located under Europe's largest glacier, could signal a replay of the global travel chaos triggered when another Icelandic peak blew four years ago, creating a massive ash cloud across Europe. Iceland's civil protection office said the eruption began just after midnight and had created a volcanic fissure of up to a kilometre (over half a mile) long.