Twenty-four people, mostly police, have died in twin suicide blasts on the same street in a high-security zone of the Anbar province capital, Ramadi.
Anbar Governor Qassim Mohammed was among 60 people wounded - his condition was described as very serious.
The first bomber was in a car while the second was on foot and wearing army uniform, police said.
The BBC's Jim Muir in Baghdad says violence has been rising as Iraq prepares for a March general election.
In a separate attack, a roadside bomb killed six Iraqi Shia Muslim pilgrims in Khalis, 80km (50 miles) north of Baghdad, police said.
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