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Investigators Probe Whether De-icing System Contributed to Minn. Bridge Collapse

August 23, 2007

MINNEAPOLIS, Minn. --- The National Transportation Safety Board is examining whether a 10-year-old de-icing system played a prominent role in the Interstate 35W bridge collapse that killed 13 people.According to Bloomberg news reports, the safety board's investigators are trying to determine whether the de-icing system, designed to prevent ice buildup on the bridge, used any chemicals with corrosive properties.In addition, the board is continuing to study the effects of a construction project on the bridge and the steel plates used to connect the structure's beams. Construction work was in progress when the bridge collapsed.
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