Central Iraq is continuing to be a thorn in the side of US-led forces.
An Iraqi was killed and three others wounded on Monday in a firefight with US forces near the town of Baquba.
The shootout occurred after US troops arrested 20 people during a house-to-house search in the village of Zagania, said police officer, Taha Abd al-Qadir.
He said the Americans removed the body of the man killed in the firefight.
The officer also said a policeman was among the three wounded.
Situated in the Diyala province, 65km northeast of Baghdad, Baquba is the site of frequent attacks on US troops occupying Iraq.
In a separate incident on Monday, the governor of Iraq's Diyala province, Dr Abd Allah al-Jaburi, narrowly escaped an assassination attempt.
A roadside bomb exploded, seriously wounding two policemen and lightly injuring a civilian, a local police officer said.
The attacks dealt a further blow to Bush, who is trying to
bolster support for his invasion of Iraq by highlighting postwar
Polls show his popularity plummeting as the cost of the war in lives and money mounts.
Washington is pushing for a new UN Security Council resolution, giving the United Nations a broader mandate to try to persuade reluctant countries to help in stabilising Iraq.
US forces also arrested the imam of the Great Mosque of Falluja, another flashpoint town in central Iraq.
Military officials said they detained 61-year-old Shaikh Jamal Nizzal after a search overnight on Monday of the mosque premises.
A neighbour told AFP that four students of the shaikh were also arrested in the search.
Nizzal has frequently urged his flock not to cooperate with US-led occupation forces.