Al-Quaeda is thought to be behind the 11 September terrorist attacks.
On Thursday, America said it had killed several men working for Bin Laden, who were hiding in Kabul and Kandahar when they were hit by US bombs.
Bin Laden himself is in hiding and only his closest followers know where he is. The US is hoping to get some information from the captured leaders on his whereabouts.
But the Pentagon admits he could have already left Afghanistan.