Spanish police have arrested two suspected members of al Qaida's North African branch.
The Interior Ministry say the pair have a similar profile to the suspects in the recent attacks in Boston.
A statement said one Algerian was arrested in the north-eastern city of Zaragoza while a Moroccan was arrested in the south-eastern city of Murcia.
The interior ministry said the two were suspected members of a cell of al Qaida in the Islamic Maghreb, a branch of al Qaida that operates in north-west Africa.
The ministry gave no immediate details as to how their profile was similar to those suspected of carrying out two bomb attacks during the Boston Marathon last week.