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We were called to reports of sinkhole at Cedar Court, off Cedarwood Drive in St Albans at 6.35am today and immediately attended the scene to ensure the area was safe. As a precaution the adjacent block of flats has been evacuated. A structural engineer has attended the scene.pic.twitter.com/c9Qos5IK2K
Our priority is to ensure the safety of residents in the area. Utility services have also been on site to ensure gas, electricity and water supplies are isolated. We are working closely with St Albans resilience team at the scene to ensure the safety wellbeing of residents.
Got it thanks. Wondering how far under the flats it goes 
Type of collapse and the historical maps all point to a classic chalk mine collapse - either 'crownhole' event or failure of shaft capping, so given probable type of working, expect extending several metres... Probability of more mines in immediate area too
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