Allison Wade says that Christmas shoppers were looking for bargains in her shop in Dudley.
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The kind gesture touched the hearts of many who shared and retweeted words of support for the officer on Twitter.
Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.
Molly is back recovering at the RSPCA centre in Coventry with her new pacemaker fitted but now needs a permanent family to look after her.