[floatl][/floatl]The squad has been questioning the colonel on a voluntary basis, the sources said.
But it has not targeted the Yomiuri Shimbun, which reported the incident in its May 31, 2005, morning edition, quoting defense sources in Japan and the United States.
Any raid carried out on a news agency to investigate its sources would stir intense public debate about the public's right to know and the freedom of the press, legal experts say.
Defense Minister Fumio Kyuma admitted Friday that an investigation was being conducted but declined comment on the case because the probe is ongoing.
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