Pile-up in Chicago
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Blizzards cause US travel chaos

Huge swathes of the US have been hit by heavy snow fall after a powerful winter storm.

Road conditions remain icy and treacherous and flights, schools and businesses have been disrupted.

In Boston, the parade to celebrate the New England Patriots' Superbowl victory has been postponed.

Ben Bland reports.

Go to next video: Time-lapse shows build up of US snow