Osama Bin Laden killed in top secret operation

Al-Qaeda leader Osama Bin Laden has been killed in a top secret operation ordered by US President Barack Obama.

The president hailed his death as a "good day for America," saying the world is now a safer and a better place.

Bin Laden is believed to have ordered the attacks on New York and Washington on 11 September 2001, as well as a number of other deadly bombings.

Mark Mardell reports.