Villages buried under volcanic ash after Mount Semeru eruption
An official from the country's disaster mitigation agency, BNPB, said in a news conference on Sunday that 14 people had been killed, nine of whom have been identified, and 56 people suffered injuries, most of them burns.
Around 1,300 people have been evacuated, while nine people remain unaccounted for, BNPB said.
Heavy rain is expected for the next three days, which could complicate evacuation efforts, a meteorological agency official said late on Sunday.
Rock debris and hot volcanic sediment were already limiting movement, local rescuers said.
BNPB will rebuild the wrecked homes, and heavy equipment, including excavators and bulldozers, is being deployed, its chief said.
The agency also said that 10 people trapped in sand mines by the eruption had been evacuated to safety.
Semeru, more than 3,600 metres high, is one of Indonesia's nearly 130 active volcanoes.
It erupted in January, causing no casualties.
Indonesia straddles the "Pacific Ring of Fire", a highly seismically active zone, where different plates on the earth’s crust meet and create a large number of earthquakes and volcanoes.
Separately, an earthquake of magnitude 6 struck north of Halmahera on Sunday, the European-Mediterranean Seismological Centre (EMSC) said.
Halmahera is about 2,000 km northeast of Semeru.