Al-Qaida’s media arm has released an audio in which the purported son of the late al-Qaida leader Osama bin Laden threatens revenge against the U.S. for assassinating his father. In the video released by As-Sahab Saturday, Hamza bin Laden tells Americans that they are accountable for the decisions of their leaders. He says al-Qaida will continue waging jihad, or holy war, against the U.S. in response to its “oppression” of Muslims. Bin Laden was killed in a May 2011 U.S. raid at his compound in Abbottabad, Pakistan. His son’s whereabouts is not known. Analysts speculate that he may be preparing to take over leadership of al-Qaida.