French police officers patrol at the Human Rights Square, near the Eiffel Tower, Paris, Tuesday April 16, 2013. In the wake of the Boston attacks, the French Interior Ministry has ordered local authorities across France to immediately reinforce security measures already in place since the January intervention in Mali began. The ministry did not change the threat level. (AP Photo/Remy de la Mauviniere)

Associated Press
French police officers patrol at the Human Rights Square, near the Eiffel Tower, Paris, Tuesday April 16, 2013. In the wake of the Boston attacks, the French Interior Ministry has ordered local authorities across France to immediately reinforce security measures already in place since the January intervention in Mali began. The ministry did not change the threat level. (AP Photo/Remy de la Mauviniere)
French police officers patrol at the Human Rights Square, near the Eiffel Tower, Paris, Tuesday April 16, 2013. In the wake of the Boston attacks, the French Interior Ministry has ordered local authorities across France to immediately reinforce security measures already in place since the January intervention in Mali began. The ministry did not change the threat level. (AP Photo/Remy de la Mauviniere)
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