Police have cordoned off a pavement in Baldock as a precautionary measure. (Image: Archant)
A pavement has been cordoned off in Baldock after an unknown substance was found in the loft of the house.
Emergency services were called to the house in London Road at about 11.10am and a cordon has been put in place as a precaution.
Tests will be carried out to establish what the substance is.
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