Major-General Muhsin Abd al-Sada, who worked as an intelligence aide to an interior deputy minister, was gunned down as he drove to work on Thursday by three men who drove by in another vehicle in the southern Dura district of the capital, an Interior Ministry official said.
In a separate incident, police Lieutenant-Colonel Alaa Khalil Ibrahim was shot dead by unknown attackers in the east of the capital, the official said.
Later, on Thursday night, one US soldier was killed and four others were wounded when an improvised explosive device went off in northern Iraq, the US military said.
The incident, targeting soldiers from Task Force Liberty, happened near Hawija, about 240km north of Baghdad, the military said in a statement.
The wounded soldiers were evacuated to a medical facility and were listed in stable condition.
Al-Jafari announced the list of
ministers on Thursday
Earlier, two Iraqi soldiers were killed and about 15 people wounded, including three US soldiers, when a car bomb exploded on Thursday morning in Tikrit, northern Iraq, Iraqi police and the US military said.
The car bomb went off at 7.30am (0330 GMT) and targeted a joint US-Iraqi military checkpoint in the north of the city, about 180km north of Baghdad, US Major Richard Goldenberg said.
Two Iraqi soldiers were killed and 10 people wounded, three of them US soldiers, Goldenberg added.
Iraqi police said that two Iraqi soldiers were killed, adding that 12 other Iraqis were wounded, seven of them soldiers.
In Samarra, about 100km north of Baghdad, a roadside bomb placed on a motorcycle killed two police officers and wounded five, police said.
Four people were also killed and 19 others wounded when a Katyusha rocket exploded in a bus station in the centre of the town of al-Msayab, south of Baghdad.
Police sources told Aljazeera that five Katyusha rockets were fired from a pickup truck. One of the rockets fell on the bus station.