Spanish police arrested 13 people Tuesday on suspicion of links to organized crime and terrorism groups.
A police statement said the detainees - 11 Pakistanis, a Nigerian and an Indian - are suspected of belonging to an international crime gang involved in passport forgery, drug trafficking and people-smuggling.
Police said they were investigating whether the group may also have supplied forged documents to international terror groups. Spanish police often use that term to refer to Islamic extremist organizations, but a police official refused to say if that applied this time.
Earlier, news reports citing police sources said 15 people had been arrested on suspicion of forging passports for use by al-Qaida members. Police in Madrid said they could not comment on that.