Was it legal for U.S.A. forces to take and dispose of Bin Laden's body?

I thought I had a basic understanding about the laws of war.
Firstly, Bin Laden should have been arrested and tried under the rule of law for his alleged crimes but I understand that this legal issue us mute (just start a gun fight).
But there must be some laws regarding removing an enemy’s body and disposing thereof after a battle?
Surely it is immoral and against The law of nations.(jus ad bellum) Can you Imagine for a second, International laws permitting such obscene behavior towards a corpse if it was one of our own?