One of Osama bin Laden's sons, Omar bin Laden, is seen in Jeddah, Saudi Arabia in 2007, in this handout photograph received in London on Jan 26, 2010. [Photo/Agencies]

WASHINGTON - The United States believes that three adults besides Osama bin Laden were killed in Sunday's raid in Pakistan and that one of the dead was an adult son of bin Laden, a senior Obama administration official said. Live report

An official also said bin Laden's death puts al-Qaida on a path of decline that will be difficult to reverse.