I just heard that they have buried him at sea in accordance with Islamic law and traditions so as not to further antagonise muslims by not burying him within 24 hours of death, which would not have been possible on land as it would have taken too long to decide where to bury him.
Personally I think they buried him at sea so that there can be no shrine made at his grave. It would have attracted fanatics for centuries to come.
And the details and newsroom commentaries continue to trickle in. I just heard an international expert say that the troops would have been instructed not to capture him alive because a trial and subsequent lifetime imprisonment would prove too complicated and problematic.