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- A police cordon, police cars and forensic investigators have been seen outside a shop, a witness has said.
- The source said forensics were seen taking photos inside an empty unit.
- It is understood about eight police cars are at the scene.
- Hertfordshire Police has been contacted for more information.
- We will be updating this live blog with more information as the situation develops.
- For more breaking news, local headlines, What’s On features and sport, follow us on social media.
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