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The disk was confiscated within two weeks of the attacks on March 11, 2004, that killed 191 people in Madrid, but Spanish investigators did not warn the FBI and the CIA until December when the full scope of the technical information became clear, El Mundo said.
The suspect, who El Mundo said had a relationship with other men formally accused in the probe, was released from jail but remains under suspicion. His brother is wanted in another investigation into a suspected al Qaeda cell in Spain, it said.