Typhoon Kalmaegi has swept past Hong Kong, closing schools and disrupting flights as strong winds pounded the territory. More than 500 flights were delayed as the storm passed by on its way to China's Hainan Island. Morning trading was cancelled on the Hong Kong stock exchange, while schools and businesses were ordered to close until the storm warning was lowered. The storm blew in from the Philippines, where it cut power and soaked farmland. At least six people are reported to have died when a ferry sank in the central Philippines on Saturday evening, after stalling in bad weather. In Manila, a ferry capsized in rough seas but all 15 crew members were rescued. But Philippine officials said the storm largely avoided heavily populated areas. The Super Shuttle Ferry 7 floats on its side after it capsized in strong winds and huge waves unleashed by Typhoon Kalmaegi, locally named Luis, in Manila Bay on 15 September 2014 In the Philippines, 15 crew members were rescued when this ferry capsized in Manila Bay A Filipino boy wades through waist-deep floodwaters at a village located beside a swollen river as it slowly recedes in suburban Quezon city, Philippines on 15 September 2014 The storm brought flooding to some areas but avoided big population centres In Hong Kong, a level eight cyclone warning was in place on Monday evening, on a 10-point scale. Twenty-five people needed hospital treatment for storm-related injuries, AFP news agency reported, citing Hong Kong's Hospital Authority. Before midday on Tuesday the warning was down to three, however, as the storm headed to Hainan. "Although Kalmaegi is moving away, occasional gales will still affect the south-western part and high ground of Hong Kong," the Hong Kong Observatory said. In China, dozens of flights were cancelled as the typhoon approached, including all flights out of Haikou, the capital of Hainan province, Xinhua news agency said.