REYKJAVIK : Iceland on Sunday raised its aviation alert over its largest volcano to the highest level of red after a new eruption nearby. The alert entails a ban on all flights below 6,000 feet (1.8 kilometres) within a radius of 10 nautical miles (18.5 kilometres, 11.5 miles) of Bardarbunga. ‘All airports are open. The area has no effect on any airports,’ the Civil Protection Office said in a statement. Sunday was the third time in a week that Iceland issued a red alert for aviation due to seismic activity near Bardarbunga.