Thursday's deadly terrorist bombings in London raised fresh concerns among Tokyo officials Friday that Japan might be the next target due to its support for the U.S.-led war on Iraq.
These concerns were aired as officials stepped up security for public transport systems and at other key locations nationwide.
An Islamic group with al-Qaeda links has claimed responsibility for the London bombings, saying on its Web site that the explosions represented retaliation for Britain's involvement in Iraq and Afghanistan.
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