At Christmas 2009 the volcano started to show signs of being active again. On 27 March 2010 it started to erupt. On 14 April 2010 Eyjafjallajökull started to erupt heavily from the top crater in the bottom left of the glacier. This made meltwater floods to rush down the nearby rivers. Many people had to be evacuated. Volcanic ash was thrown several kilometres into the atmosphere. The dust blow over northwest Europe on the 15th and 16th April 2010. It became very dangerous for aeroplanes to fly and so all commercial flights were stopped in most parts of northern Europe. This caused chaos for travellers, many of whom were trying to return home after their Easter vacation. The chaos continued for many days.