Al-Qaeda leader Osama Bin Laden has been killed by US forces in Pakistan, President Barack Obama has said.

The al-Qaeda leader was killed in a ground operation outside Islamabad based on US intelligence, the first lead for which emerged last August.

Mr Obama said after “a firefight”, US forces took possession of his body.

Bin Laden was accused of being behind a number of atrocities, including the attacks on New York and Washington on 11 September 2001.

He was top of the US’ “most wanted” list.

Mr Obama said it was “the most significant achievement to date in our nation’s effort to defeat al-Qaeda”.

The US has put its embassies around the world on alert, warning Americans of the possibility of al-Qaeda reprisal attacks for Bin Laden’s killing.