A charity is calling for everyone routinely admitted to hospitals in Northamptonshire to be tested for HIV.
Levels of the virus in the county are double the national average. There is also concern that nearly 70% of HIV carriers in Northampton are diagnosed late.
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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.