US special operations forces killed Osama Bin Laden this past Sunday but the slaying is raising major concerns that the United States has gone too far in judge, juror and executioner of the world's most wanted man.

Further more, the killing could work against the US to stir up more anti-American sentiment among radical militants.

The White House said on Tuesday that bin Laden had resisted the team that stormed his mansion in Pakistan, forcing them to shoot him. Official also said he was not armed, however.

Officials did not give details on what kind of resistance he put up, but defended their actions.

The top US law enforcement official tried to dismiss questions over whether Sunday's killing was legal, saying in no uncertain terms he is proud of the assault and it was justified as an act of national self defense.

The was the head of al Qaeda, the organization that had conducted the attacks of September 11th. He admitted his involvement ... [and] he said he would not be taken alive, Attorney General Eric Holder told the Senate Judiciary Committee.

But some International Law experts believe that the proper thing to do was to bring the terrorist leader to trial.

High-profile Australian human rights lawyer Geoffrey Robertson roundly condemned the action.

It's not justice. It's a perversion of the term,  Robertson told Australian Broadcasting Corp television from London.

Justice means taking someone to court, finding them guilty upon evidence and sentencing them. This man has been subject to summary execution, and what is now appearing after a good deal of disinformation from the White House is it may well have been a cold-blooded assassination.

If true, the move could stir up anti-American sentiment in populations already hostile to Western culture.

Former West German Chancellor Helmut Schmidt told German TV the operation could have incalculable consequences in the Arab world at a time of unrest there.

It was quite clearly a violation of international law, Former West German Chancellor Helmut Schmidt told German TV. He said the operation could have incalculable consequences in the Arab world at a time of unrest there.

Robertson said bin Laden should have stood trial, just as World War Two Nazis were tried at Nuremburg or former Yugoslav President Slobodan Milosevic was put on trial at the war crimes tribunal in The Hague.

The last thing he wanted was to be put on trial, to be convicted and to end his life in a prison farm in upstate New York. What he wanted was exactly what he got - to be shot in mid-jihad and get a fast track to paradise and the Americans have given him that.