Here is link to news article regarding the collapse of the I-35 bridge in Minneapolis.

http://minnesota.publicradio.org/display/web/2007/08/06/bridgetroubles/?rsssource=1

Here is NTSB update on bridge collapse.

http://www.ntsb.gov/Pressrel/2007/080807.htm

Article from Popular Mechanics.

http://www.popularmechanics.com/technology/transportation/4219981.html

News release from Department of Transportation.
http://www.dot.gov/affairs/dot7407.htm

Fact Sheet

http://www.dot.gov/affairs/dot7407.htm

Article from Design News.

http://www.designnews.com/article/CA6465051.html?industryid=43654

Here are some updates on NTSB's investigation of the I-35W bridge collapse:
Second Update , August 22, 2007
NTSB Third Update , Sept. 5, 2007:
NTSB Chairman Testifies Before The House On Structurally Deficient Bridges, Sept 5, 2007
Fourth Update , October 23, 2007

Minnesota Public Radio reports that investigators have a working theory that blames design and weight for the I-35W bridge collapse. Read the story

NTSB investigators blame bad gusset plate design for collapse of bridge.
Read NTSB news release .
Read news reports: MPR , Minneapolis Star Tribune , ThomasNet.com