The FBI is investigating the role played by Fifa president Sepp Blatter in a $100m (£66.2m) bribes scandal, a BBC investigation has discovered.Sports marketing company ISL paid a total of $100m to officials including former Fifa president Joao Havelange and ex-Fifa executive Ricardo Teixeira.In return, ISL was granted lucrative television and marketing rights throughout the 1990s.Blatter denied knowing about the bribes and took no action.He even allowed Teixeira to take part in the notorious vote for the 2018 and 2022 World Cups. -BBC