2004 Madrid train bombings
A Frenchman, Pierre Camatte, captured in Mali in November by the same group was released last month, following a controversial decision to release four militants from a Malian jail. In the case of the Spanish aid workers, there have been reports that the kidnappers are demanding similar releases of detainees from Spanish custody, as well as a ransom. Spain currently holds dozens of convicted or suspected Islamic militants, including those convicted for the 
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Kidnapped Spanish aid worker is released