The vast majority of entries this week are about the 2004 Madrid train bombings and al-Qaeda in Spain. A suspect Spanish policeman sold a house to Moutaz Almallah, one of the bombers, in 1995, some of the bombers could have been arrested in a general sweep of al-Qaeda-linked militants in Spain after 9/11, but were not, although one of the masterminds was photographed with top al-Qaeda operative Barakat Yarkas. However, surveillance of the bombers continued and an informant spied on their secret meetings. The police learned one of the masterminds was preparing for "violent action", and another mastermind was surrounded by informants.

One informer monitored the bombers closely, and realized another of the alleged bombers also worked for the police. The wife of one of the bombers gave police stunning details about his activities in 2003 and they started monitoring a house used by he bombers based on a tip-off from her. She warned police the bombers were planning a suicide attack, and continued reporting on the group. Police received a big tip that could have prevented the bombings, monitored the apartment of one of the masterminds, and turned down the chance to videotape the bombers' meetings.

Al-Qaeda in Spain, 9/11 Commission’s Investigation of NSA, Torture – Additions as of April 27, 2008