The 2010 eruptions of Mount Merapi began in late October 2010. Large eruption columns formed, causing numerous pyroclastic flows down the heavily populated slopes of the volcano. Merapi's eruption was said by authorities to be the largest since the 1870s.
Over 350,000 people were evacuated from the affected area. However, many remained behind or returned to their homes while the eruptions were continuing. 353 people were killed during the eruptions, many as a result of pyroclastic flows. The ash plumes from the volcano also caused major disruption to aviation across Java.