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Dean referred to the videotape when asked whether he was linking U.S. troops in Iraq to the deaths in Spain.
"That was what they said in the tape," Dean said. "They made that connection, I'm simply repeating it."
European intelligence agencies are trying to identify a purported al-Qaida operative who claimed in a videotape that the group carried out the bombings to punish Spain for backing of the U.S.-led war in Iraq.