Two female legislators also called for Prime Minister Nouri al-Maliki to be summoned to parliament to give assurances that justice would be done.

The March 12 attack on the family in Mahmoudiya, south of Baghdad, was among the worst in a series of cases of U.S. troops accused of killing and abusing Iraqi civilians. Iraq's largest newspaper, Azzaman, said in an editorial Tuesday the rape "summarizes what has been going in Iraq for the past years not only by the American occupation army, but also by some Iraqi groups."

Former Pfc. Steven D. Green appeared in federal court in Charlotte, N.C., on Monday to face murder and rape charges. At least four other U.S. soldiers still in Iraq are under investigation, and the military has stressed it is taking the allegations seriously.

"If this act actually happened, it constitutes an ugly and unethical crime, monstrous and inhuman," said Justice Minister Hashim Abdul-Rahman al-Shebli, a Sunni Arab. "The Iraqi judiciary should be informed about this investigation which should be conducted under supervision of international and human organizations. Those involved should face justice."

"The ugliness of this crime demands a swift intervention of the U.N. Security Council to stop these violations of human rights and to condemn them so that they will not happen again," he added.

The two lawmakers, Safiya al-Suhail and Ayda al-Sharif, said condemnation was not enough.

"We demand severe punishment for the five soldiers involved," al-Sharif said. "Denouncements are not enough. If this act has taken place in another country, the world would have turned upside down."

Al-Suhail said al-Maliki should appear before parliament "to make sure investigations are taking place."

Mahmoudiya Mayor Mouayad Fadhil said Iraqi authorities have started their own investigation and that he had asked the hospital where the victims were taken for more details.

Green is accused of raping the woman and killing her and three relatives an adult male and female and a girl estimated to be 5 years old. An official familiar with the investigation said he set fire to the rape victim's body in an apparent cover-up attempt.

Iraqi authorities identified the rape victim as Abeer Qassim Hamza. The other victims were her father, Qassim Hamza, her mother, Fikhriya Taha, and her sister, Hadeel Qassim Hamza.