08-03-2007 Minneapolis -- U.S. Coast Guard units from the Eighth and Ninth District respond to the collapse of the I-35W bridge. Coast Guard units from Sector Upper Mississippi River, Sector Lake Michigan, Sector Sault Ste Marie and Maritime Safety and Security Team New York enforced a security zone on the Mississippi River near the bridge collapse, allowing responders uninterupted access to the collapse sight. Photo by Chief Petty Officer Marcus S. Evans.