US President Barack Obama on Thursday said America is at war against Al-Qaeda and do whatever it takes to defeat them. At the same time, he asserted that his policy of dialogue with the Muslim community across the globe would continue.

"Over the past two weeks, we have been reminded again of the challenge we face in protecting our country against a foe that is bent on our destruction...let's be clear about what this moment demands. We are at war," Obama said in his speech at White House.