US warplanes have struck suspected rebel targets in the western Iraqi city of Fallujah.
Iraq's interim government has warned that it will launch a major offensive in Fallujah if the city does not hand over militant Abu Musab al-Zarqawi and his followers.
Earlier, the US military said reports that Jordanian militant had been detained in Iraq were not credible.
‘We have heard those reports and we do not believe they are true, Lt Cl Steve Boylan, a US military spokesman, told Reuters.
A Kuwaiti news agency had reported that al-Zarqawi was believed to be among 10 militants seized in raids in Fallujah.
Separately, two US military helicopters crashed near Baghdad this evening, reportedly killing two US soldiers and wounding two others.
A US military spokesman was the incident was under investigation.
Three US soldiers die in car bomb
Elsewhere in Iraq, three US soldiers were killed in a suicide car bomb attack in the town of Qaim near the country's border with Syria. In a separate mortar attack in the town, three Iraqis were killed and 30 others were injured.
A fourth US soldier died earlier of the injuries he sustained in a car bomb attack on a US convoy in the northern Iraqi city of Mosul on Friday.
Three members of an Iraqi family were killed in a separate explosion near the city of Baquba, northeast of Baghdad.
In the capital, Baghdad, one person was killed and five were wounded when a rocket or mortar struck the compound of the hospital in the centre of the capital. A rocket also struck the car park of a hotel used by foreign news organisations in the city, but no-one was injured.
The explosions followed five overnight bomb blasts that damaged five Christian churches in the capital.
A spokesman for the country's Interior Ministry said that the co-ordinated attacks on the churches all took place within a one-hour period beginning at 2am Irish time. No-one was injured.
