Indonesia has closed Mount Bromo national park in East Java for all tourist activities, its operator said late on Saturday, as a wildfire, burning since Monday, expanded in its caldera area.The closure took effect from Saturday evening, for an undetermined duration, the park operator ⁠said on its ​official Instagram ⁠page.The raging fire has burned an area of around 176 ⁠hectares (434.91 acres) at Mount Bromo, an ​active ⁠volcano that is ‌a popular tourist destination known for its "sand sea" caldera – a volcanic ash plain.A wildfire burns in Bromo Tengger Semeru National Park near Mount Bromo in Probolinggo, East Java province on 6 August 2026 (AFP/Getty)The wildfire has expanded from around ‌60 hectares on Thursday."This ‌closure is a crucial step to maintain safety of visitors, staff and people in the surrounding ⁠areas," it said, adding that people who have bought entrance tickets will be able to reschedule visits or seek a refund.East Java's disaster mitigation agency said authorities are deploying water bombing helicopters and water ‌spraying drones to bolster efforts to extinguish ​the fire.Footage uploaded by ‌the park's operator ⁠on social media showed fire spreading across ⁠the slopes of the mountain overnight.Authorities have ‌not declared ​what caused the fire, ‌and there have been ​no casualties reported.