a region around the pacific ocean, indonesia is prone to volcanoes and earthquakes. in 2018, a volcano in the strait betweenjava and sumatra islands killed more than 400 people. sodaba haidare, bbc news. our correspondent, valdya bara putri, gave us this update on the search for survivors. eyewitnesses on the scene say that lava mud is still flowing in a nearby river where a bridge had collapsed. the fresh lava mud that flows in the river is also still emitting smoke. meanwhile, the sedimentation of the lava mud covers the river and the riverside area up to 40 100 metres high. it covers not only people s houses roofs, but also a factory building. the indonesian geological agency warns that there might be follow up eruptions that can happen