"I want the people of France to know that the United States stands with you today, stands with you tomorrow," Obama said at a speaking engagement in Tennessee, describing France as America's "oldest ally."
"The moment that the outrageous attack took place, we directed all of our law enforcement and counterintelligence operations to provide whatever support that our ally needs in confronting this challenge," Obama added.
Obama was speaking hours after the crisis that began with the massacre of 12 people at satirical weekly Charlie Hebdo reached a dramatic climax, with French police storming two hostage sites, killing two brothers wanted for the newspaper attack and a jihadist ally.
"President Hollande made it clear they'll do whatever is necessary to protect their people and I think it's important for us to understand France is our oldest ally."
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US Secretary of State John Kerry honored the victims and congratulated French security forces yesterday evening at the French embassy in Washington, where he signed a book of condolences.
Kerry offered his sympathies for the "nightmare" France has experienced in the past days.
"Vive la France," French-speaking Kerry wrote in conclusion.