Ali al-Haidri had survived a previous assassination bid
Baghdad governor Ali al-Haidri has been shot dead in a roadside ambush in the Iraqi capital, the highest-profile assassination there since May.
Attackers shot at his armoured-plated car from different directions as his convoy drove through northern Baghdad.
Violence has been escalating ahead of elections planned for 30 January.
In a separate incident, at least 10 people have been killed and about 60 others injured in a bomb blast at a police post in Baghdad, officials say.
A suicide bomber rammed a fuel truck into a checkpoint near the Green Zone, the heavily fortified government and diplomatic compound.
The explosion shook the city and turned the immediate area into an inferno, says BBC correspondent Jim Muir in Baghdad.
Eight policemen were said to have died in the attack near a special Iraqi forces command post.
Mr Haidri is the most senior Iraqi official to be assassinated in Baghdad since the head of the Governing Council was killed by a suicide bomb in May last year.
At least one of his bodyguards was also killed in the attack, in the Hurriyah district on the west bank of the Tigris river.
3 January 2005:
More than 20 people killed in a day of violence across Iraq
2 January 2005:
At least 23 Iraqi soldiers killed by a car bomb in Balad
27 December 2004:
13 die in a Baghdad car bomb targeting a top Shia political leader
21 December 2004:
Suicide blast in a US military base in Mosul kills 22 people
19 December 2004:
More than 60 die in twin suicide car attacks in Najaf and Karbala
Iraqi insurgents have repeatedly targeted government officials around the country.
Mr Haidri escaped assassination in a roadside bomb attack in September.
In Thailand, US Secretary of State Colin Powell expressed regret at Tuesday's assassination, but said Iraq's elections will go ahead.
The most recent attacks come a day after at least 20 people were killed across the country.
There were at least two suicide car bomb attacks on Baghdad on Monday.
Three Britons and an American were among those killed. Another suicide car bomb targeted the offices of interim Prime Minister Iyad Allawi, killing another four people.