In the first attack, which took place at around 8:45 am (0445 GMT) just southwest of Baghdad, three soldiers were hurt when their convoy was hit by "an improvised explosive device," said Pentagon spokeswoman Diane Perry, who said one soldier was only lightly wounded and was able to return to his unit immediately after the incident.

The second attack, also on a convoy of US soldiers, occurred about one hour later (at around 0545 GMT) in central Baghdad. Three soldiers were wounded in that attack, which US Defense Department officials said also used an unspecified "explosive device."

Perry said two Iraqis were also injured in the attacks, one of whom later died in the hospital.

When asked whether the Pentagon was aware of any incidents in the past 24 hours in which US troops were killed, Perry answered: "None."

According to eyewitnesses, four US soldiers were killed and two others wounded Tuesday in a rocket-propelled grenade (RPG) attack on their vehicle by unknown assailants in central Baghdad.

The attack occurred at 10:00 am (0600 GMT), when assailants fired an RPG at a US Humvee light multi-wheeled vehicle near a gas station in the al-Mustansiriya neighborhood, they said.

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