Osama Bin Laden's son is set to become the new leader of Al-Qaeda and wants to exact revenge for his father's death, according to an ex-FBI agent, who led the investigation into the terrorist group following the 9/11 attacks. In an interview to be aired on CBS on Sunday, former agent Ali Soufan claims that letters seized in the raid in which Bin Laden was killed in 2011 indicate that his son will follow in his footsteps. Hamza Bin Laden allegedly wrote: "I consider myself to be forged in steel. The path of jihad for the sake of God is what we live," according to Soufan. The final tranche of declassified material captured during the Bin Laden raid was declassified earlier this year. The former FBI agent said the letters suggest Hamza adored his father and wants to continue his legacy by seeking revenge against the US. "He's basically saying, 'American people, we're coming and you're going to feel it. And we're going to take revenge for what you did to my father… Iraq… Afghanistan'… the