The U.S. military says three American soldiers have been killed in a roadside bomb blast in northern Iraq.

The military says one soldier was also wounded in the explosion that hit their combat patrol in the town of Balad, north of Baghdad, late Wednesday.

In another development, Arab League Secretary-General Amr Moussa flew to Baghdad Thursday, - on his first visit to Iraq since the 2003 U.S. - led invasion.

Mr. Moussa is to hold talks with senior Iraqi leaders and also meet the country's most influential Shi'ite cleric, Grand Ayatollah Ali al-Sistani.

The 34-member Arab League has been criticized for not strongly condemning the insurgency in Iraq and also for not taking a more active role in supporting the post-Saddam Iraqi government.

Some information for this report provided by AP, AFP and Reuters.