Residents of Indoesia's Tagulandang are in despair after Mount Ruang volcano erupted on Tuesday and left the island uninhabitable.
The Center for Volcanology and Geological Hazard Mitigation (PVMBG) has also warned of a potential tsunami triggered by volcanic material collapsing into the ocean.
Video shared by Indonesia's disaster agency showed lightning flashing above Ruang's crater when it erupted on Tuesday.
Reuters witnessed collapsing roofs on most houses on Tagulandang island, with roads and building debris blanketed in a thick layer of volcanic ash.
Many are awaiting evacuation to Manado, the capital of North Sulawesi province in the north-central region of the sprawling Indonesian archipelago.
Indonesia's Disaster Agency (BNPB) said that, as of Thursday afternoon, 3,364 people had been evacuated from Tagulandang island, with more than 5,000 inhabitants remaining.
BNPB head Suharyanto expects the remaining residents to be evacuated within the next three days.
A state of emergency, effective until May 14, has been declared by local government to facilitate aid access though authorities said the airport at Manado will remain closed until Friday.

Kenyan court charges 8 schoolgirls with fellow students' murder
At least 5 people killed in fire in Antwerp apartment block
Three people die in Mexico World Cup celebrations as fans crowd streets
US and Iran enter technical talks to secure peace deal, shipping restart
After Venezuela quakes, citizens lead rescues amid military theft accusations
Two dead after wildfire guts house in northern Greece
Afghanistan launches airstrikes on IS targets on border with Pakistan
Bangladesh warns of dengue surge as weather aids spread
