The United States is offering up to a $1 million (£750,000) reward for information on Hamza Bin Laden, Osama’s son, who they say is “emerging as a leader in the al-Qaeda franchise”.
It is thought that he is based near the Afghan-Pakistan border, and has in recent years released audio and video messages urging followers to attack the US and their Western allies in revenge for his father’s killing.
In 2011, US special forces killed Osama Bin Laden in a compound in Abbottabad, Pakistan. He approved the attacks on the US on 11 September 2001, in which nearly 3,000 people were killed.
The US state department say that Hamza is around 30-years old and married the daughter of Mohammed Atta, who was one of the terrorists who hijacked an aircraft and flew it into the twin towers in the 2001 attack.
Letters from Osama Bin Laden seized from his compound indicated that he had been grooming Hamza, thought to be his favourite son, to replace him as leader of al-Qaeda.
US officials say that currently al-Qaeda is rebuilding, and although “relatively quiet”, they call this a “strategic pause” and continue to be a threat to the US and their allies.