Former Al Qaeda leader Usama bin Laden entered Pakistan across the Afghan border during the early months of U.S. attacks on Afghanistan, then spent nine years on the run in Pakistan living in several safe houses and fathering four children.

Testimony from bin Laden's youngest wife -- the 29-year-old Yemenite Amal Ahmed Abdulfattah -- before a joint investigation team in Pakistan reveals the Al Qaeda kingpin fled over the border into Pakistan early in 2002, just after the U.S. launched attacks on Tora Bora in eastern Afghanistan.

In the testimony -- first cited Thursday by the Pakistani newspaper Dawn -- Abdulfattah told investigators that she married bin Laden in 2000 because she wanted to marry a mujahid, or holy warrior.

Her account of bin Laden's movements in the nine years leading up to his death in May 2011 raises further questions about what exactly Pakistani authorities knew.

It also threatens to further strain relations between Pakistan and the U.S., just days after U.S.