Tessa Trace a charity worker for Age UK in Leicestershire says a couple encouraging people to donate their winter fuel allowance is so valuable to the work Age UK do over the winter months.
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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.