A son of Osama bin Laden, Hamza, is reportedly seeking to avenge his father’s death and is poised to become the new leader of terrorists group, Al Qaeda.

Personal letters discovered during the raid that killed bin Laden show that Hamza, is set on avenging his father’s death.

A former FBI agent, Ali Soufan, told CBS News in an interview that will air Sunday.

Soufan said of Bin Laden son, “He tells him that … he remembers ‘every look… every smile you gave me, every word you told me.'”

Soufan also said that Hamza wrote that he considers himself “to be forged in steel.”

According to Soufan, Hamza’s path to become the leader of the terrorist organisation was created years ago when he was used as a propaganda tool in bin Laden’s videos.

“He was seen sometimes holding a gun,” the agent said, adding that “he has even started to sound like his father.

“His recent message that came out, he delivered the speech as if it’s his father, using sentences, terminology that was used by Osama bin Laden.”

Hamza who is about 28 years old has been named as a “specially designated global terrorist” by the U.S., as he has recorded four audio messages in the last two years, aimed at the U.S.

Soufan said, “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 whole thing was about vengeance.”