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He was the world's most wanted man, the mastermind of 9/11, the man whose acts triggered the war on terror that has defined the century so far. And now he is dead.

Osama bin Laden was reportedly shot in the head during a firefight in a compound in Pakistan. President Obama announced the news at 2330 Washington time, saying it was "the most significant achievement to date in our nation's effort to defeat al-Qaeda".

We've already seen some of the reaction as people in the US have taken to the streets to celebrate, gathering outside of Ground Zero in New York and the White House in Washington.

But there have also been warnings that in the short-term, people should be on high alert and look out for the risk of reprisal attacks.

So what's your reaction to his death?