Spain is marking the second anniversary of the Madrid train bombings Saturday, with a number of quiet remembrances.
Prime Minister Jose Luis Rodriguez Zapatero was scheduled to attend a ceremony honoring the 191 people killed in the 2004 bombings.
More than 1,500 others were injured in the March 11 terrorist attack - the most severe in the country's history. Islamic militants claimed responsibility, saying the bombings were revenge for Spain sending troops to Afghanistan and Iraq.
Spanish authorities have detained more than 100 people in connection with the attack. Lead government prosecutor Juan del Olma is expected to finish his investigation in the coming weeks.
That would allow a trial to begin later this year.