DUBAI, July 10 (Reuters) - The son of slain al Qaeda leader Osama bin Laden has threatened revenge against the United States for assassinating his father, according to an audio message posted online.
Hamza bin Laden promised to continue the global militant group's fight against the United States and its allies in the 21-minute speech entitled "We Are All Osama," according to the SITE Intelligence Group.
"As for the revenge by the Islamic nation for Sheikh Osama, may Allah have mercy on him, it is not revenge for Osama the person but it is revenge for those who defended Islam."
Osama bin Laden was killed at his Pakistani hideout by U.S. commandos in 2011 in a major blow to the militant group which carried out the Sept. 11, 2001 attacks.
Documents recovered from bin Laden's compound and published by the United States last year alleged that his aides tried to reunite the militant leader with Hamza, who had been held under house arrest in Iran.
2011 death of Osama bin Laden
2011 Osama bin Laden death
2011 Osama bin Laden death
U.S. President Barack Obama stands after addressing the nation on TV from the East Room of the White House to make a televised statement May 1, 2011 in Washington, DC. Bin Laden has been killed near Islamabad, Pakistan almost a decade after the terrorist attacks of Sept. 11, 2001 and his body is in possession of the United States. (Photo by Brendan Smialowski-Pool/Getty Images)
In this handout image provided by The White House, President Barack Obama, Vice President Joe Biden, Secretary of State Hillary Clinton and members of the national security team receive an update on the mission against Osama bin Laden in the Situation Room of the White House May 1, 2011 in Washington, DC. Obama later announced that the United States had killed Bin Laden in an operation led by U.S. Special Forces at a compound in Abbottabad, Pakistan. (Photo by Pete Souza/The White House via Getty Images)
A newspaper vendor displays papers heralding the death of Osama Bin Laden on May 2, 2011 in New York City. President Barack Obama announced the death of Osama bin Laden during a late night address to the nation from the White House in Washington on May 1. The mastermind of the September 11 terrorist attacks was killed in an American military operation at a compound in Pakistan. (Photo by Spencer Platt/Getty Images)
US Marines of Regiment Combat Team 1 (RCT 1) watch TV as President Barack Obama announces the death of Osama Bin Laden, at Camp Dwyer in Helman Province, on May 2, 2011. US President Barack Obama said on May 1, 2011 that justice had been done after the September 11, 2001 attacks with the death of Osama bin Laden, but warned that Al-Qaeda will still try to attack the US. (Photo by Bay Ismoyo via AFP/Getty Images)
People celebrate in Times Square after the death of accused 9-11 mastermind Osama bin Laden was announced by U.S. President Barack Obama May 2, 2011 in New York City. Bin Laden was killed in an operation by U.S. Navy Seals in a compound in Abbottabad, Pakistan. (Photo by Mario Tama/Getty Images)
Newspapers left by visitors grace the fence overlooking the crash site of Flight 93 following the announcement that Osama Bin Laden had been killed in Pakistan May 2, 2011 in Shanksville, Pennsylvania. Nearly 10 years after September 11, 2001 construction is underway to erect a formal memorial at the crash site. Last night U.S. President Barack Obama announced that the United States had killed the most-wanted terrorist Osama Bin Laden in an operation led by U.S. Special Forces in a compound in Abbottabad, Pakistan. (Photo by Jeff Swensen/Getty Images)
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Hamza, now in his mid-twenties, was at his father's side in Afghanistan before the 9/11 attacks and spent time with him in Pakistan after the U.S.-led invasion pushed much of al Qaeda's senior leadership there, according to the Brookings Institution.
Introduced by the organization's new chief Ayman al-Zawahiri in an audio message last year, Hamza provides a younger voice for the group whose aging leaders have struggled to inspire militants around the world galvanized by Islamic State.
"Hamza provides a new face for al Qaeda, one that directly connects to the group's founder. He is an articulate and dangerous enemy," according to Bruce Riedel of Brookings.