At least 37 people, including call centre staff from an American firm, are believed to have perished in a fire that tore through a shopping centre in the southern Philippine city of Davao, local authorities said on Sunday. President Rodrigo Duterte, himself a Davao native, visited distraught relatives outside the burning building overnight Saturday but told them there was “zero” chance their loved ones had survived, witnesses said. Firefighters found one body as the blaze was finally extinguished on Sunday, Davao Mayor Sara Duterte – the president’s daughter – told reporters. Firefighters have concluded that all those trapped in the building are dead, she said, adding: “They assessed that no one would survive in that heat and with that thick, black smoke.” The fire adds fresh misery for mainly Catholic Philippines at Christmas after tropical storms killed hundreds of people and displaced tens of thousands in recent days. The blaze started at the four-storey NCCC Mall on Saturday morning sending thick plumes of black smoke billowing into the sky over Davao. With low wages but strong English language skills, the Philippines is a popular destination for call The building’s top floor housed a 24-hour call centre for US multinational SSI, a market research company. Jimmy Quimsing, a retired seaman, was one of the relatives desperately waiting for news. His 25-year-old son Jim Benedict worked at the call centre and had not been in contact since the fire broke out. Quimsing said he spoke to President Duterte and had been told to prepare for the worst. “He told us zero, no one would survive under these circumstances,” he said. Duterte’s special assistant Christopher Go confirmed the bulk of the conversation. Paolo Duterte, the president’s son and the vice mayor of Davao, also wrote on Facebook that fire officials had told him there was “zero” chance of anyone trapped surviving the blaze. In a statement on its local Facebook page SSI Philippines Davao said it would set up a “command centre” for relatives of those missing. “Please continue to pray for everyone’s safety,” the firm added. Davao fire marshal Honeyfritz Alagano said the blaze may have started with a spark on the third floor of the mall, which boasted a furniture section. “One of our firemen here has a kid who is an [call centre] agent in there. He told us some of them went to collect their stuff at their lockers and were trapped,” Alagano said. “The mall is an enclosed space with no ventilation. When our firemen tried to enter they were pushed back by smoke and fire.” Mayor Duterte said she told the firefighters to retrieve all the dead, stressing: “you do not stop until you find 37.” She also said the circumstances surrounding the fire would be investigated but added that it was too early to say who was at fault. “It’s possible that while they were working, they did not immediately notice the fire spreading,” Davao police officer Ralph Canoy said, referring to the call centre workers. Davao, with a population of about 1.5 million people, is the biggest city in the southern Philippines. It is about 1,000km south of Manila. The president served as mayor for more than two decades and continues to go home there on weekends from his work at the presidential palace in Manila. Deadly blazes occur regularly in the Philippines, particularly in slum areas where there are virtually no fire safety standards. Seventy-two people were killed in 2015 when a fire tore through a shoe factory in Manila. Survivors of that blaze blamed barred windows and other sweatshop conditions for trapping people inside the factory. In the deadliest fire in the Philippines in recent times, 162 people were killed in a huge blaze that gutted a Manila disco in 1996.