Officers using specialist equipment are examining land around the Cariad Farm site in Marshfield, Newport.
The search - prompted by suspicion a body has been buried there - is expected to last for several days.
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Darren Osborne from Pentwyn, Cardiff was arrested by police in the early hours of Monday after allegedly ramming his van into worshipers.
A landlord has been fined at Cardiff Magistrates Court after pleading guilty to 8 charges relating to a property in Albany Road, Cardiff.
Owner Maria Caulfield, 32, was stunned when the toy from her son's bow and arrow set vanished as eight-week-old Lola played in the house.