In 2003, The New York Times reported that a member of Qatar's royal family operated the Qatar safe house that the al-Qaeda leader Abu Musab al-Zarqawi stayed in when traveling in and out of Afghanistan. The article identifies the Qatari royal family member as Abdulkarim al-Thani, adding that he also provided Qatari passports and over $1 million in funds to support the terrorist network while traveling through Qatar.[2] Al-Zarqawi ended up founding the predecessor of ISIS, al-Qaeda in Iraq.
The mastermind behind the 9/11 attacks, Khalid Sheikh Mohammed, also reportedly sought shelter in Qatar with the assistance of al-Thani.[3]