Residents said they are used to Mount Sinabung's eruptions and that Monday's eruption was not as big as the previous ones, hence their reluctance to evacuate.

Mount Sinabung on Indonesia has erupted, spewing a column of black ash and smoke 3,500 meters from the top of the mountain into the sky over Sumatra island

Sinabung on North Sumatra’s Karo Plateau was considered to be dormant for centuries before it suddenly erupted in 2010