Search and rescue efforts for a boat carrying eight people, including five journalists covering the eruption of Indonesia's Anak Krakatau volcano, resumed on Wednesday, according to local media reports.
The eruption threw air traffic in Indonesia into chaos with tens of thousands of people stranded on Java and Sumatra since the weekend and multiple airports shut due to volcanic ash.
The missing journalists are Indonesian citizens and are employed by local and international media including state news agency Antara and Turkish state-run news agency Anadolu, the Jakarta Post reported.
The boat set out on Monday but lost contact soon after departure, the National Search and Rescue Agency said. There has so far been no clear explanation for the boat's disappearance.
A search began on Tuesday but was temporarily suspended due to large waves and dangerous conditions.
Anak Krakatau, which means Child of Krakatau, was created after the legendary eruption of Krakatau volcano in 1883, which killed an estimated 35,000 people.
Indonesia, an archipelago of more than 17,000 islands, lies on the Pacific Ring of Fire, a zone of intense seismic and volcanic activity. It is home to around 120 active volcanoes, more than any other country.