He was on the FBI’s most wanted list of suspected terrorists, and on the run for nearly 20 years.
Ahmed al-Mughassil, now 48 years old, has been captured in Lebanon and transferred to Saudi Arabia, according to several media reports.
Saudi authorities did not comment. The news was first reported by Saudi newspaper Asharq Alawsat.
Since 2001, the FBI had identified al-Mughassil as the mastermind of the 1996 bombing of the Khobar Towers residence at a US military base in Saudi Arabia. The truck bomb attack killed 19 U.S. service staff and wounded almost 500 people.
The FBI has described al-Mughassil as the military chief of the Saudi wing of Hezbollah, which has ties with Iran. Saudi Arabia and the United States have accused Iran of commanding the bombing, but Tehran has denied any involvement.