Police say the two, who were preparing to leave the country bound for Morocco, allegedly were part of a support group for IS that has contained other jihadists who have previously staged several suicide missions in Syria.
According to a police statement, those arrested today are a Moroccan man and a Spanish woman who both lived in the southern city of Granada.
Investigators discovered that a brother of the arrested man had died in a suicide attack and were searching the couple's home. The couple's son was taken into the care by Spanish social services.