(Photograph courtesy BBC News Web Site and hertfordshire Fire and Rescue Service)
Residents reported that the hole had substantially opened up to form a void 20 m wide and up to 10 m deep. As a precaution 10 people have been evacuated and water, electricity and gas supplies have been switched off to 58 homes in Fontmell Close and Bridal Close.
There are no reports of injuries nor cars being swallowed up (as happened with a sink hole in Walter's Ash, near High Wycombe some while ago (February 2014).
Prior to last night apparently there had been a "small hole" which had been scheduled for backfilling. It now looks like a more substantial engineering solution will be required.
The press have not stated a cause, but it is likely to be the result of a solution feature migrating up to the surface, given that St. Albans is underlain by the Chalk
The British Geological Survey (BGS) have not provided any information on their web site but may well do before too long now that the sink hole has been reported on the BBC web site.
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