The eruption of Indonesia’s Mount Anak Krakatau disrupted air travel around Jakarta on Sunday, while schools and fishing activities in nearby areas were also affected by volcanic ash.

Soekarno Hatta International Airport announced through Instagram that flight operations would remain suspended until 9:30 a.m. local time because ash from the volcano had reached the area.

Indonesia’s Transportation Ministry said the disruption, which extended an earlier suspension that was expected to last until 5:30 a.m., affected 209 flights. The impacted services included a number of international flights.

Mount Anak Krakatau has remained active since late Friday. According to the Transportation Ministry, volcanic ash was observed at the airport during the early hours of Sunday.

Indonesia’s meteorological agency, BMKG, reported that ash reached an altitude of around 20,000 feet, or 6,000 metres, on the Java side of the volcano. A volcanic plume rising to approximately 50,000 feet, or 15,000 metres, was also observed toward Sumatra and parts of Banten province on Java.

The volcano is situated between the Indonesian islands of Java and Sumatra. Indonesia forms part of the Pacific Ring of Fire, an area known for frequent earthquakes and volcanic activity.

The country’s disaster management agency, BNPB, called on residents to stay calm while remaining alert. Officials advised people to use masks and eye protection during ashfall, limit time spent outdoors, protect water supplies and drive carefully because volcanic ash can make roads and visibility hazardous.

Several schools called off planned activities on Saturday after students and local residents reportedly experienced eye irritation caused by volcanic ash. Fishermen in affected areas also suspended their trips because of the eruption, according to local media reports.

Despite the eruption, Indonesia’s disaster management authorities said on Saturday that there was no immediate threat of a tsunami from Mount Anak Krakatau.