BAGHDAD, Iraq (CNN) -- A top Sunni Arab political activist, another sheik and their driver were killed in a shooting Monday afternoon after a meeting with local tribal chiefs in Falluja, west of Baghdad, a party official and police sources said.Sheikh Ayad al-Izzi, an Iraqi Islamic Party official, had been involved in the development of a new Iraqi constitution and the parliamentary elections on December 15.The attack happened in Zaydun, 25 miles (40 kilometers) west of Baghdad near Abu Ghraib prison, as the party was heading from Anbar province to Baghdad.The other sheik was identified as Ali al-Isawi, also a member of the Iraqi Islamic Party.An aide from Iraqi President Jalal Talabani's office condemned the killings and offered condolences to the victims' families.In a separate attack, two journalists for the state-run al-Iraqiya TV network were killed Monday in Baghdad, police said.Gunmen inside a car opened fire on Aqeel Abdul Ridha and Muqdad Muhsin in the western Baghdad neighborhood of Adil, police said.Five bystanders also were wounded, police said.Aid workers kidnappedFour Western aid workers in Iraq, including two from Canada, one from the United States and another from Britain, have been kidnapped, according to U.S., British and Canadian government officials.Dan McTeague, parliamentary secretary for Canadians abroad, said the four were kidnapped Saturday, but he declined to identify the agency with which they are affiliated.McTeague said the government is working to find out more about the circumstances surrounding the abductions. He said the government won't negotiate with kidnappers.The British Foreign Office confirmed that a British citizen, identified as Norman Kember, was one of those abducted.The U.S. Embassy in Baghdad said Monday that it could confirm reports an American working in Iraq was missing.Other developmentsThe chief judge in Saddam Hussein's trial adjourned it until December 5 to allow time for the defense to replace two attorneys who were killed recently. Joining Hussein's defense team is former U.S. Attorney General Ramsey Clark, who questioned the adequacy of security measures for the defense team and attorneys' families. (Full story)The Iraqi army has detained a former intelligence officer from Hussein's regime alleged to be involved in a plot to kill Raad Johi, the head judge in the trial of the former Iraqi leader, a high-ranking Iraqi army official said. The intelligence officer, Khaz'al al-Kurdi, was detained Saturday in the northern city of Kirkuk after being under surveillance for three days, the army official said. Six others also were detained.Former Iraqi Prime Minister Ayad Allawi said in an interview published Sunday in Britain that human rights abuses in Iraq are as bad as, if not worse than, they were under Hussein. (Full story)Medical tests show that the injuries suffered by two U.S. congressmen in Iraq over the weekend were not serious, Rep. Tim Murphy said. The Pennsylvania Republican was one of three congressmen riding in a U.S. military convoy when their vehicle went off the road. (Full story) Three American soldiers were slightly wounded Monday when a car bomb detonated near a military patrol in Baquba, north of Baghdad, the U.S. military said.