Indonesia has raised its alert for Mount Merapi to its highest level on Monday and ordered people living near the rumbling volcano to move immediately to safer areas. Seismic activity has escalated dramatically at the volcano on the densely populated island of Java, with increasing lava spurts. The state office of volcanology said an eruption could be imminent.The volcano, 26 kilometres south of Yogyakarta, is the most active of the 69 volcanoes with histories of eruptions in Indonesia. It last erupted in June 2006 killing two people, but its deadliest eruption occurred in 1930 when more than 1,300 people were killed.