Nineteen US servicemen were killed when the Khobar Towers in Dhahran, Saudi Arabia, were bombed in 1996. The housing complex, located in the vicinity of national oil company headquarters, was being used to house US military personnel.
Saudi Arabia absolved Iran of charges in 1998, claiming that only Saudi citizens were responsible for the attack. However, the US continued pressing on with its claims that Iran played a role and asked the Iranian government for help with the investigation. Iran rejected the request. The US never brought formal charges against Iranian officials.