A weekend of commemoration is underway in Devon to mark the 70th anniversary of perhaps the biggest wartime disaster on British soil.
Exercise Tiger was planned as a dry run for the D-Day landings. But it left hundreds of US servicemen dead. The whole story was covered up for decades.
Bob Cruwys reports:
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Heavy snow shut a 64-mile stretch of road between Exeter and Bodmin.
Overnight temperatures will fall below zero; any snow melt will turn to ice
Snow melt likely to refreeze overnight creating icy conditions tomorrow