An Indonesian volcano spewed ash thousands of metres into the air on Friday in its most violent eruption since rumbling back to life earlier this week for the first time in 400 years. The volcano which erupted again early Friday morning lasted for 13 minutes sending a column of ash as high as 3,000 metres into the air. Government volcanologist said, this is the biggest eruption and was felt about eight kilometres away. He said, continuous tremors were recorded since last evening that indicated an intense magma movement inside the volcano. Thousands of people have fled their homes since the 2,460-metre Sinabung in northern Sumatra started to erupt on Sunday after centuries of inactivity.