Indonesian authorities have shut Mount Bromo National Park (an active volcano and popular tourist destination in East Java known for its dramatic "sand sea" caldera) to all visitors after a wildfire that began on Monday expanded to roughly 176 hectares. The closure, announced Saturday evening with no set end date, came as the blaze nearly tripled from an estimated 60 hectares earlier in the week, with footage showing flames spreading across the mountain's slopes overnight. No casualties have been reported, and water-bombing helicopters and drones have been deployed to fight the fire, whose cause has not yet been determined.