The turnstiles at the One Call stadium, in Quarry Lane, open an hour before the whistle, with the kick-off scheduled for 4pm #FACup
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A large tent has been put up around the area while investigations continue.
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.