BAGHDAD, IRAQ - MAY 24: An Iraqi boy climbs boards a boat to cross the Tigris River on May 24, 2007 in Baghdad, Iraq. A number of Iraqis have turned to use boats to cross the banks of the Tigris River after the bombing of at least four bridges in Baghdad.

BAGHDAD, IRAQ - MAY 24: Iraqis sit in boats as they wait to cross the Tigris River on May 24, 2007 in Baghdad, Iraq.

BAGHDAD, IRAQ - MAY 24: Iraqis alight from a boat after crossing the Tigris River on May 24, 2007 in Baghdad, Iraq.

BAGHDAD, IRAQ - MAY 24: Iraqis alight from a boat after crossing the Tigris River on May 24, 2007 in Baghdad, Iraq.

BAGHDAD, IRAQ - MAY 24: Iraqis alight from a boat after crossing the Tigris River on May 24, 2007 in Baghdad, Iraq.

BAGHDAD, IRAQ - MAY 24: Iraqis sit in a boat waiting to cross the Tigris River on May 24, 2007 in Baghdad, Iraq. A number of Iraqis have turned to use boats to cross the banks of the Tigris River after the bombing of at least four bridges in Baghdad.