The execution of Saddam Hussein's co-defendants will take place on Sunday morning as world nations made noise — or stayed quiet — about the handling of the former Iraqi dictator's hanging, a governmental adviser said.

Barzan Ibrahim and Awad al-Bandar will be executed early Sunday, following the conclusion of the Muslim Eid holiday, amid calls to spare them and high emotions over the conduct at Saddam's hanging, Iraqi Prime Minister Nouri al-Maliki's adviser, Mariam al-Rays, told FOX News.

The Bush administration sent conflicting signals Wednesday about the conduct of some at the execution, with video footage showing the ousted leader insulted and shouted at, and the White House declining to join criticism; however, the State Department and U.S. military publicly raised questions about it.

"If you are asking me: 'Would we have done things differently?' Yes, we would have. But that's not our decision. That's the government of Iraq's decision," Maj. Gen. William B. Caldwell said.

Saddam Hussein, who was convicted for the killings of 148 Shiites, was dignified and courteous to his American jailers up to the moment he was handed over to the Iraqis outside the execution chamber, a U.S. military spokesman said.

He "was courteous, as he always had been, to his U.S. military police guards," Caldwell said.

"He spoke very well to our military police, as he always had. And when getting off there at the prison site, he said farewell to his interpreter. He thanked the military police squad, the lieutenant, the squad leader, the medical doctor we had present, and the colonel that was on site."

Caldwell said no Americans were present for the hanging and that the tumultuous execution would have gone differently had the Americans been in charge.

As the storm over the handling of the hanging gained strength, Caldwell was among several U.S. officials who suggested displeasure with the conduct of the execution, but the White House declined to join in the criticism.

"The president is focused on the new way forward in Iraq so these issues are best addressed out of Iraq, out of Baghdad," deputy White House press secretary Scott Stanzel said. "Prime Minister Maliki's staff have already expressed their disappointment in the filmings, so I guess we'll leave it at that."

Iraqi authorities report the arrests of two guards and an official in the investigation into who taunted Saddam Hussein as he stood on the gallows and took cell phone pictures showing his body dangling at the end of a rope.

Click here to view the full video of Saddam's execution.

The unauthorized video has ignited protests by Saddam's fellow Sunni Arabs in various Iraqi cities and threatens to make a martyr out of the ousted dictator. Saddam was shown never bowing his head as he faced death, and asking the hecklers if they were acting in a manly way.

The second-guessing over the conduct of the execution came as a video turned up of four Americans and an Austrian abducted in November in southern Iraq. The hostages spoke briefly and appeared uninjured in a video believed to have been recorded nearly two weeks ago and delivered Wednesday to The Associated Press.

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The men — security contractors for the Crescent Security Group based in Kuwait — appeared separately on the edited video, and three of them said they were being treated well. They were kidnapped Nov. 16 when suspected militiamen in Iraqi police uniforms ambushed a convoy of trucks being escorted by Crescent Security on a highway near the southern border city of Safwan.

In violence Thursday, two bombs exploded in Baghdad's upscale Mansour neighborhood, killing 13 people and wounding at least 25, police said. Mansour is a primarily Sunni neighborhood in western Baghdad.

National Security Adviser Mowaffak al-Rubaie and two other top officials variously reported one to three men were detained in connection with how Saddam's execution was conducted.

"The investigation has already had an arrest warrant against one person and two to follow," al-Rubaie said in an interview. He said the guard force at the execution was infiltrated by an Arab television station or another outsider.

The clandestine footage appeared on Al-Jazeera television and Web sites just hours after Saddam was hanged Saturday. The tumultuous scenes quickly overshadowed an official execution video, which was muted and showed none of the uproar among those on the floor of the chamber below the gallows.

Sami al-Askeri, a Shiite lawmaker who advises Prime Minister Nouri al-Maliki, said two "Justice Ministry guards were being questioned. The investigation committee is interrogating the men. If it is found that any official was involved, he will face legal measures."

A second key al-Maliki adviser, who spoke on condition of anonymity because he was not authorized to release the information, reported the arrest of the official who supervised the execution and said he videotaped the execution.

Prosecutor Munqith al-Faroon, one of 14 official witnesses to the execution, told The Associated Press that he saw two government officials using camera phones at the hanging but did not know their names.

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The Associated Press contributed to this report.