Osama Bin Laden is threatening to kill captured Americans in a new audio message released Thursday.

Bin Laden warned that if the U.S. executes self-proclaimed 9/11 mastermind Khalid Sheik Mohammed, that would be a death sentence for captured Americans.

Mohammed is currently behind bars at Guantanamo Bay prison.

The Obama administration is still deciding on wether to try him in a military tribunal or a civilian court.