Although it had undergone no historically reported eruptions, the Nabro Volcano erupted shortly after midnight local time on 13 June 2011, after a series of earthquakes up to magnitude 5.7 in the Eritrea-Ethiopia border region. The ash plume was seen on satellite drifting to the west-northwest along the border, spanning about 50 km wide and several hundred kilometres across in the hours immediately following the reported eruption, and reportedly reaching high.