Domestic flights resumed at one of Indonesia's busiest airports Sunday after a fire destroyed the terminal and left one person injured, an official said, according to AP. Polonia Airport is located in Indonesia's third-largest city, Medan, the regional capital of Sumatra island. It handles about 4.5 million passengers a year and has been criticized in the past for reportedly operating far beyond its capacity. The cause of the fire, which broke out late Saturday, was believed to be a short circuit on the domestic terminal's second floor, North Sumatra police chief Maj. Gen. Nurudin Usman told reporters. Forensic teams were investigating. The main terminal was closed «because almost all of the infrastructure was razed,» said Yuli Sudoso, the top airport administrator, adding that one firefighter was hospitalized for burns. Tents were set up for check-in and boarding and domestic flights were running with delays from the international terminal and a nearby air force base, Sudoso said. Air travel is a major form of domestic transportation in Indonesia, a sprawling nation of 235 million people spread over 17,500 tropical islands.