Police Surveillance and Informants
In the investigations carried out after the bombings to find out what went wrong in the security services, many individual negligences and miscoordinations between different branches of the police were found. The group dealing with Islamist extremists was very small and in spite of having carried out some surveillances, they were unable to stop the bombings. Also some of the criminals involved in the "Little Mafia" who provided the explosives were police informants and had leaked to their case officers some tips that were not followed up on.
Some of the alleged perpetrators of the bombing were reportedly under surveillance by the Spanish police since 2001.
Read more about this topic: 2004 Madrid Train Bombings
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“There was never a man born so wise or good, but one or more companions came into the world with him, who delight in his faculty, and report it. I cannot see without awe, that no man thinks alone and no man acts alone, but the divine assessors who came up with him into life,—now under one disguise, now under another,—like a police in citizen’s clothes, walk with him, step for step, through all kingdoms of time.”
—Ralph Waldo Emerson (1803–1882)