A huge clean-up operation is under way in the Australian state of Queensland after a powerful cyclone swept through the region, tearing roofs off buildings, downing trees and forcing tourists to bunker down at luxury island resorts. The Whitsunday Islands in the heart of the Great Barrier Reef suffered “substantial damage” when Cyclone Debbie swept through yesterday, and roads have been cut off around coastal towns, state Premier Annastacia Palaszczuk told ABC television Wednesday. Andrew Willcox, a regional mayor, told the broadcaster the town of Bowen looks “like a war zone.” Severe weather warnings remain in place even after Debbie was downgraded to a tropical low overnight as it moved inland, with damaging wind and heavy rain expected to cause flooding, according to the Bureau of Meteorology. The storm halted at least 20 percent of coal output from the biggest producing basin in Queensland, with BHP Billiton Ltd. and Glencore Plc suspending operations. Previous storms across the region have flooded mines, swamped machinery and washed away rail tracks, leading to price spikes amid crimped supply. The Port of Townsville, which handles approximately A$30 million ($21 million) in trade per day, said shipping would resume this morning, after it evacuated vessels and personnel on Monday. Palaszczuk said the extent of the damage would become apparent as dawn breaks. The Daydream Island resort, which has 200 guests and 60 staff, was running low on water, while authorities were trying to make contact with Hayman Island, she said. There were limited reports of injuries in storm-affected areas, the premier told the ABC.