Bomb disposal experts have been working at a house in Frome Road, Trowbridge, and a man has been arrested after "inert substances" were found at the property.
Wiltshire Police began inquries on Friday fter a tip-off from a member of the public.
A force spokesman said the Explosive Ordnance Disposal team was working to remove the substance which is not thought to be of any danger.
The house, near Clarendon Academy, remains sealed off.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article