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Falluja has become a place where large numbers of foreign fighters remain," a senior military official, speaking on condition of anonymity, told reporters in Baghdad. "We are concerned about this. We don't know if it has become a clearinghouse for terrorists, but we are watching it closely."
Earlier, the military said in a statement that it had carried out an attack on a safehouse belonging to a "known Zarqawi network."
The killers of the South Korean, Kim Sun Il, an interpreter, were believed to be members of a group called Jamaat al-Tawhid and Jihad, which is linked to the Jordanian terrorist, Abu Musab al-Zarqawi.
Today, militants threatened to assassinate the prime minister, Iyad Allawi. "As for you, Allawi — sorry, the democratically elected prime minister — we have found for you a useful poison and a sure sword," a taped voice, represented as that of Mr. Zarqawi, said on an Islamist Web site, according to Reuters.