Indonesia's Mount Ruang volcano erupts again Tuesday

Indonesia's Mount Ruang volcano erupted Tuesday, prompting authorities to order an evacuation and forcing a nearby airport to close.

Indonesia's geological agency raised the alert level on Sulawesi Island to its highest level, as the eruption blew clouds of ash, lava and rocks as high as two kilometers into the sky.

The agency urged residents living within a six-kilometer radius of Mount Ruang to evacuate.