The anticipated eruption of Bali’s Mount Agung began over the weekend, and although a contingency plan has been in place since late September, flights to and from the region have been grounded.

Three separate volcanic surges forced a cloud of smoke, steam, and volcanic ash 4.7 miles into the air, according to Quartz. As a result, flights to and from Ngurah Rai International Airport were canceled, leaving nearly 8,000 people stranded in Indonesia.

Flights to Bali have been suspended through at least Tuesday, and many flights scheduled to the island of Lombok have also been canceled on some airlines, the Wall Street Journal reported.

By Saturday evening, local volcanologists increased the severity of the eruption from phreatic (steam) to magmatic, after fire and lava were spotted near the summit. Bali’s volcanic activity could easily continue for another month.

In addition to ash and magma, authorities have warned that the volcano could trigger devastating mudflows.

Travelers should expect cancelations to continue while the Agung Volcano Observatory’s aviation color code remains red — meaning a serious eruption is imminent.

If you have plans to travel to Bali, check directly with your airline for information about cancelations, re-routed itineraries, and travel vouchers.

For regular Mount Agung updates, travelers should also refer to the Bali Tourism Hospitality Task Force, which was established to handle tourism-related services in anticipation of this eruption.