DOHA - A US AH-1W "Super Cobra" attack helicopter crashed in central Iraq early Saturday killing two pilots, the US Central Command announced.
"Preliminary indications are that the crash was not a result of hostile fire," a statement said, adding: "The cause of the crash is under investigation."
Names were being withheld pending next-of-kin notification.
Three US soldiers were killed in a vehicle accident at Baghdad's main airport, now under US control, a US commander said.
Colonel Will Grimsley, commander of the First Brigade of the US Army's 3rd Infantry Division, said the three were killed late Friday in "an armored vehicle incident" but gave no details.
The names of the soldiers were withheld pending notification of relatives.
Blair blasts Britons over Iraq war