Following are some of the week's major developments:

* Izzedin Salim, the president of the 25-member Iraqi Governing Council, was killed Monday in a suicide car bombing as his motorcade waited to enter the headquarters of the U.S. occupation authority. Salim, a religious scholar and newspaper editor from the southern city of Basra, was the highest-ranking political figure to die in what appears to be an effort by insurgents to target Iraqis working with the United States. Ghazi Yawar, a Sunni Muslim member of the Governing Council, was picked to serve the last two weeks of Salim's term and the month of June, when the occupation authority is to hand over limited power to an interim Iraqi government.

* In the first court-martial related to the abuse of detainees at the Abu Ghraib prison, Spec. Jeremy Sivits pleaded guilty to four counts for photographing naked Iraqis. His testimony will be used against others accused of abusing the prisoners. Three of them -- Sgt. Javal S. Davis, Staff Sgt. Ivan L. "Chip" Frederick II and Spec. Charles A. Graner Jr. -- who, like Sivits, are from the 372nd Military Police Company, based in Maryland -- also appeared in court in Baghdad but entered no plea. Sivits was sentenced to a year in prison, suffered a reduction in rank and received a bad-conduct discharge.

* Army Gen. John P. Abizaid, the top commander of U.S. troops in Iraq and Afghanistan, testified before Congress that a broad Army investigation of military detention facilities in both countries found no pattern of abuse. But he acknowledged that "overcrowding" and other "systemic problems" may have contributed to the abuse of detainees at Abu Ghraib, outside Baghdad.

* U.S. ground forces and aircraft attacked a village in the western desert near Syria on Wednesday, striking what Iraqi witnesses said was a wedding celebration and what U.S. officials called a way station for foreign infiltrators. More than 40 civilians, most of them women and children, were killed, according to witnesses, Iraqi police officers and provincial health officials.

* Iraqi police backed by U.S. troops raided the home of Ahmed Chalabi, an Iraqi Governing Council member who was once the Pentagon's pick to run postwar Iraq. Officials later said they were seeking 15 people, including at least one member of Chalabi's Iraqi National Congress, on charges that included fraud and kidnapping. In coordinated searches, U.S. troops seized computers, files and dozens of rifles from two offices of the INC, a coalition of political parties that opposed Saddam Hussein.

Chalabi told reporters that the raids were retribution for his increasingly strident criticism of the American management of post-Hussein Iraq. But Hussein Muathin, a judge with the Central Criminal Court of Iraq, said the raids were part of an investigation into crimes including the detaining and torturing of people, the theft of government cars, and the illegal seizure of government facilities. Chalabi himself has not been charged

* The Pentagon will move 3,600 ground troops from South Korea to Iraq this summer, to help deal with security problems. The move will reduce U.S. forces in Korea by 10 percent.

* An artillery shell containing the nerve gas sarin exploded near a U.S. military convoy in Baghdad, releasing a small amount of the chemical and slightly injuring two ordnance-disposal experts.