US officials are scrambling to get a critical Baltimore port reopened after a bridge collapse.\xa0
A fully-laden container ship lost power and rammed into a support of the Francis Scott Key Bridge.\xa0
They were able to send a distress signal in time for officials to shut the bridge.\xa0
Ninety seconds later it collapsed, and six people remain unaccounted for.\xa0
Baltimore port is one of America's biggest, and US correspondent Richard Arnold told Mike Hosking that it will take a while to get it back in working order.\xa0
He says they will have to clear out all the wreckage from the shallow waters first, which will be a massive job.\xa0
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