A book on the crisis sparked by a Danish newspaper's publication of cartoons of the Prophet Mohammed five years ago hit stores in Denmark on Thursday amid concerns over a backlash from the Muslim world.

At one bookshop in Copenhagen, staff prepared for a busy day of trading with Flemming Rose's "The Tyranny of Silence" on the shelves, but fears were also high after a month in which Denmark faced two new security alerts.

On Tuesday an Iraqi Kurd being held in Norway on suspicion of planning bombings admitted that his target was the Jyllands-Posten daily.

Exactly five years ago -- on September 30, 2005 -- the newspaper, where Rose was cultural editor, ran a front-page spread featuring 12 cartoons of the Prophet Mohammed.

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