US Secretary of Defense Mark Esper has confirmed the death of Hamza bin Laden, the son and designated heir of al-Qaeda founder Osama bin Laden. "Thats my understanding," Esper said in an interview late Wednesday with Fox News, when asked if Hamza bin Laden was dead. "I dont have the details on that. And if I did Im not sure how much I could share with you," he added, according to AFP. US media reported at the beginning of August that bin Laden was killed during the last two years in an operation that involved the United States, citing US intelligence officials. But President Donald Trump and other senior officials have refused to confirm or deny it publicly. "I dont want to comment on it," Trump told reporters when asked. The 15th of Osama bin Ladens 20 children and a son of his third wife, Hamza, thought to be about 30 years old, was "emerging as a leader in the al-Qaeda franchise," the State Department said in announcing the reward. He had put out audio and video messages calling for attacks on the United States and other countries, especially to avenge his fathers killing by US forces in Pakistan in May 2011, the department said. That work made him important in attracting a new generation of followers to the extremist group which carried out the September 11, 2001 attacks on the US which left nearly 3,000 dead. His fathers death in 2011 and the rise of the more virulent ISIS group saw al-Qaeda lose currency with younger extremists, but the group appears to have been plotting a stealthy comeback under leader Ayman al-Zawahiri.