In June 1996, a
massive truck bomb exploded outside the US Air Force base at Khobar in eastern Saudi Arabia, killing 19 American soldiers and wounding several hundred. Subsequent American and Saudi investigations blamed Hizbullah al-Hijaz for the attack. From its founding in 1987, the Hezbollah al-Hejaz group had advocated violence and perpetrated several terrorist attacks in Saudi Arabia during late 1980s. After the diplomatic thaw between the Saudi Arabian and Iranian governments in 1990, the group ceased its attacks in the early 1990s. A series of crackdowns launched by the Saudi government after the Khobar Towers bombing almost completely eradicated the organization. Former US Secretary of Defence
William Perry asserted in 2007 that he now believed that al-Qaeda was responsible for the Khobar attack. Back in the day, US had not taken al-Qaeda seriously. However, al-Qaeda never claimed responsibility for the attacks. Thomas Hegghammer asserted that, during that period, al-Qaeda lacked the sufficient technical capacity to launch such an extensive attack. Others have said that on balance, the available evidence suggests Shiite responsibility. After the Khobar bombing most of the members and people associated with the Hezbollah al-Hejaz were arrested by Saudi authorities. The organization practically ceased to exist. Many of the members of the organization has since been released. Several others, including those indicted by US authorities, still remain in jail in Saudi Arabia without trial. The alleged head of the military wing of Hezbollah al-Hejaz,
Ahmed Ibrahim Al-Mughassil, who was suspected of involvement in the Khobar bombing, was reportedly captured in Beirut in August 2015 and transferred to Saudi Arabia. ==Designation as a terrorist organization==