Mount Sinabung had been dormant for more than 400 years when it erupted in 2010 Thousands of people living close to a volcano in Indonesia have been forced to flee their homes after it began erupting violently. Mount Sinabung, on the island of Sumatra, became active again in 2010 but there has been more activity since 2 June. Before 2010, the volcano had been dormant for more than 400 years. At least 3,000 people living near its slopes have had to leave, including 1,200 on Monday alone. Scientists worry the volcano could pose more dangers in the coming weeks. The danger alert for Mount Sinabung is now at its highest level Pyroclastic flows - surges of hot ash and rock - speed down the side of Mount Sinabung A close-up of volcanic ash flowing down from Mount Sinabung Thousands more people are likely to have to flee in the coming days On Monday, there were at least 28 pyroclastic flows - surges of hot ash and gas that rush down the side of the mountain at high speed. Gede ...