Madrid , Spain ( CNN ) -- Four suspected Islamic militants are due to go on trial Thursday afternoon in Madrid for allegedly aiding fugitives from the Madrid train bombings of 2004 , a National Court spokesman told CNN . Prosecutor Miguel Angel Carballo , at Spain 's National Court , seeks sentences of eight to 13 years in prison against the four male suspects , who include a Moroccan , an Algerian , a Tunisian , and a fourth man whose nationality was not immediately disclosed , said the spokesman , who by custom is not identified . The prosecutor alleges the suspects provided clandestine lodging in Madrid and in a Barcelona suburb , as well as other aid to various fugitives who `` were directly implicated '' in the Madrid train bombings that killed 191 people and wounded more than 1,800 , the spokesman said . Spanish courts already have convicted 14 Islamic militants for their roles in the train bombings , along with four Spaniards , the latter for trafficking in explosives used in the attacks . Additionally , seven other prime Islamic suspects in the attacks blew themselves up three weeks after the train bombings as police closed in on their hideout in a Madrid suburb . That explosion also killed a police officer and wounded various others . The seventh anniversary of the train bombings was two weeks ago on March 11 . Last February , Spain 's Supreme Court overturned a lower court 's conviction of five other men for Islamic terrorist activities that included aiding fugitives from the Madrid train bombings and planning other attacks , according to the court order made public March 2 . The National Court in January 2010 had convicted the five other men -- - three Moroccans , an Algerian and a Turk -- - for collaborating or belonging to an Islamic terrorist group and sentenced them to prison terms from five to nine years . But the Supreme Court disagreed , ruling that telephone wiretaps used to gain crucial evidence against those five suspects lacked the proper protections under Spain 's constitution , and there was `` insufficient evidence , beyond all reasonable doubt , '' to prove the crimes that prosecutors alleged . Those five men were in a group based in a Barcelona suburb , Santa Coloma de Gramenet , before police made arrests in June 2005 . Some of the suspects to go on trial Thursday also allegedly operated their network to aid fugitives from the same Barcelona suburb . The trial is expected to last several days .
Prosecutor says the four aided fugitives from the 2004 Madrid train bombing . He is seeking sentences of eight to 13 years in prison . The Madrid train bombing killed 191 people .