A fire at the training ground of Rio de Janeiro soccer club Flamengo killed 10 people and injured at least three others on Friday, firefighters said. The fire broke out at Ninho do Urubu, a state-of-the-art training centre that was expanded and opened only two months ago. The facility has accommodation for teenage players. "The kids from the Flamengo youth team were sleeping there at the time," firefighter Douglas Henaut told Globo News. Television channel Globo reported that youth players were among the dead, although it did not cite its sources. Aerial footage showed corrugated iron roofs distorted by the fire and piles of charred items. Nearby trees were also scorched by the flames. After years of financial difficulties, Flamengo last year spent $6.2 million to expand the Ninho do Urubu facilities. In addition to accommodation for young players, the facilities include several pitches, an aquatic park, a gym, a medical centre and a mini stadium. The Ninho do Urubu, or Vulture's Nest, is so called because the club's symbol is a vulture. Vinicius Junior, the teenage Real Madrid forward who trained at the facility before joining for the Spanish giants last year, tweeted his condolences. "What sad News! Praying for everyone! Strength, strength, strength," he wrote. The fire follows days of heavy rains that hit the city and claimed at least six lives. Flamengo, who boasts club legends such as Zico, Junior and Leonardo, is one of the best-supported clubs in Brazil and is famous around the world. Known by fans as the red-and-black, they won the Copa Libertadores, South America's version of the Champions League, in 1981 and lifted the Intercontinental Cup a few months later