Security officials in Iraq say at least three Iraqi policemen have been killed and seven others wounded in a roadside bomb attack in the northern city of Kirkuk.

Authorities say the attack occurred Saturday as police took part in a funeral procession for a comrade killed by insurgents on Friday.

Insurgents have killed hundreds of policemen in a bloody campaign to topple Iraq's U.S.-backed government.

Saturday's attack came on the second anniversary of the beginning of the war in Iraq.

U.S. Defense Secretary Donald Rumsfeld told Pentagon workers Friday that Iraq has made remarkable changes since U.S.-led forces invaded the country to topple Saddam Hussein.