A search and rescue operation is underway in the United States after a cargo vessel slammed into the central support pillar of one of the largest bridges on America's eastern seaboard.
The bridge in Baltimore collapsed within seconds, with an unknown number of motorists and other people swept into the icy river beneath it.
Early reports suggest the vessel suffered a cataursophic power failure moments before the accident.
Our Washington Correspondent Simon Marks reports.
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Our US Correspondent Simon Marks says there is growing evidence that a power failure aboard the cargo vessel may have contributed to the disaster.
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