The United States has begun broadcasting warnings to people in Afghanistan informing them how to tell the difference between unexploded cluster bomb units and airdropped food parcels -- both of which are yellow.

The Pentagon says it is changing the color of the food aid packages being dropped over Afghanistan because of fears they could be confused with unexploded cluster bombs.

The United Nations warned Wednesday that humanitarian food rations being distributed in Iraq by U.S.-led coalition forces are wrapped in the same yellow packaging as deadly so-called bomblets being airdropped by the coalition.