Firefighters shot jets of water onto one of Madrid's tallest office buildings Sunday morning, fighting to control a blaze that burned all night and threatened to bring down the 32-storey skyscraper. "We are battling Madrid's most important fire in its history," said mayor Alberto Ruiz-Gallardon speaking from the scene at about 9 a.m. (0800GMT). "The situation right now is still of high risk," he added, 10 hours after fire engulfed the Windsor Building in the heart of Madrid's business and banking district. "It will take hours until this fire is declared under control." There were no reported injuries except for three firefighters who suffered smoke inhalation and exhaustion. At its peak, temperatures reached 800 degrees Celsius (1,472 F), said Javier Sanz, head of Madrid firefighters, on Sunday.