 A suicide note left behind indicated that they intended to die in the attack.It has been reported that his motive was to avenge the death of a friend killed in the Iraq War by a Shia death squad, hate against the West over Palestine, and that he had been radicalized by the teachings of al Qaeda and al-Zarqawi.The Islamic organization Hizb ut-Tahrir denies reports from the "Telegraph" that Abdullah was a member.