American forces were led to Osama bin Laden by his most trusted courier, a Kuwaiti-born man named Sheikh Abu Ahmed, three US officials revealed.
Ahmed was a shadowy figure for US intelligence, someone it took many years to identify. For a long time, intelligence officials knew him only by his "nom de guerre", Abu Ahmed al-Kuwaiti.
The first indications about his significance came from CIA detainees shortly after the September 11, 2001 terrorist attacks.
Ahmed and his brother were killed in the same pre-dawn raid on Monday that left bin Laden dead.