Spanish judge released nine suspects in the Madrid train bombing investigation from detention on Wednesday, ruling there was insufficient evidence to remand them, a court official said. The judge, however, said they were suspected of collaboration with an armed group and ordered them all to report to court weekly. The nine men were part of a group of 13 arrested on Friday on suspicion of ties to prime suspects in the March 11, 2004 attacks that killed 191 people and wounded 2,000. The other four have already been released from detention.All 13 -- six Moroccans, four Syrians, an Egyptian, a Palestinian and an Algerian -- are still accused of collaborating with Islamist militants who carried out Europe's most devastating al Qaeda-linked attack. The nine freed on Wednesday, and one of the men freed earlier this week, must report to the court weekly.