Spanish police arrested 13 people Friday in connection with the train bombings that killed 191 people in Madrid last year, and the suspected al-Qaida leader who allegedly inspired the attacks was extradited from Belgium.
Youssef Belhadj, a 28-year-old Moroccan who was arrested in Belgium shortly after the bombings, was jailed in Spain on 191 counts of murder, a court official said.
The Interior Ministry said six Moroccans, four Syrians, one Egyptian, one Palestinian and one Algerian were arrested in raids in and around Madrid.
Four of the Moroccans are brothers linked to Belhadj, the suspect in whose name the attacks were claimed.
A police spokesman said the brothers, whose family name is Haddad, put Belhadj up in Madrid during a visit in 2003.
The spokesman said the 13 were suspected of being involved in preparations for the attacks, rather than in carrying out the bombings that also wounded more than 1,500.
Among those detained was 33-year-old Mahamad Tiazounie, of Syrian origin, who is considered the personal assistant of a Tunisian named Serhane Ben Abdelmajid Fakhet, one of seven key suspects who killed themselves in a suicide blast on April 3 as police moved in to arrest them.
Police said there could be more arrests.
More than 20 people, most of them Moroccan, have been jailed on provisional charges in connection with the attacks on four commuter trains. More than 50 others are considered suspects but are not detained.