Indonesia halted operations at its main international airport outside Jakarta on Sunday after ash spewed from the Anak Krakatoa volcano more than 150km (93 miles) away, impacting thousands of passengers.
Mount Anak Krakatoa erupted on Saturday, producing a fountain of lava and booming sounds that could be heard up to a few hundred kilometres away, the geology agency said in a statement.
Two new eruptions were recorded on Sunday, the volcanology agency warned.
Ash from the volcano was detected in the airspace surrounding Soekarno-Hatta International Airport, prompting authorities to initially suspend operations from 1.30am on Sunday to 5.30am.
The suspension was extended three times, with the latest ending at 5.30pm on Sunday “due to increased eruptive activity”, the airport said in a social media post.
Operations have been suspended at six airports including the Hussein Sastranegara airport in Bandung and Radin Inten II airport near Bandar Lampung on Sumatra, the country’s Transportation Minister Dudy Purwagandhi said.