The U.S. military says 60 suspected extremists have been killed in northern Iraq, during the first week of a major offensive against flashpoints of militant activity.

U.S. military sources say nearly 200 other suspects have been detained during the operation, known as Iron Harvest. It is part of a larger nationwide offensive targeting al-Qaida in Iraq, which the U.S. military has identified as the greatest single threat to Iraq's security.

Coalition and Iraqi security forces also have found 79 weapons caches - one of which was discovered in an underground bunker complex in Diyala province north of Baghdad.

Earlier Monday, Iraqi officials said gunmen killed a senior Iraqi judge and his driver as they were traveling to work in Baghdad.

Officials say the attackers opened fire on the judge's car in the city's western Mansour district.

The assassinated judge, Amir Jawdat al-Naeib, had served on Iraq's appeals court. He also was a member of Iraq's Supreme Judicial Council, which nominates the chief justice and other senior officials.

Separately, a parked car bomb wounded six people when it exploded near a police patrol in southern Mosul, north of Baghdad.

Meanwhile, special ceremonies were held in Irbil Monday to honor 354 victims of the 1988 Anfal campaign, waged during former Iraqi President Saddam Hussein's tenure.

The remains of the victims were found in mass graves in Mosel, Hatra and Missan. Several senior Iraqi and Iraqi-Kurdish officials attended the ceremonies.