Iraqi police say at least 16 bus passengers were killed by a roadside bomb Tuesday in southern Iraq.

A police spokesman says the bus was traveling from the port city of Basra to Nasariyah.  At least 22 people were wounded in the blast. 

No other details were immediately available.

In other news, the U.S. military says a bomb attack Monday killed three American soldiers and their translator in the Iraqi province of Diyala.  In a separate incident, the military said a suspected suicide bomb attack killed five U.S. soldiers on foot patrol in Baghdad.

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