Spain's Interior Ministry said police have detained eight people suspected of forming a group that recruited jihadist militants to fight in Iraq and Syria.
The ministry said the eight were arrested Monday in Madrid.
A ministry statement said the Islamic cell found and dispatched recruits for the Islamic State of Iraq and the Levant, or ISIL.
The government statement said the group was led by a former Guantanamo Bay inmate who was arrested in Afghanistan in 2001.
The nationalities of the detainees were not immediately clear.
Spain has arrested several dozen suspected jihadist militants in recent years.