BOSTON (Reuters) - Some of Citigroup Inc's banking sites went down for about half an hour on Wednesday, making its online banking system temporarily inaccessible to customers, some of whom were housebound in the wake of giant storm Sandy. Bank spokesman Andrew Brent said the outage also affected applications for mobile devices such as the iPad, but that all sites and apps had been restored to service. It was not clear what caused the problem, which occurred after the New York-based bank moved some of its operations to backup facilities. ...

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