Wrexham town centre ground to a halt when bomb squad experts were called to a suspect package.
Streets in Wrexham were cordoned off
Grosvenor Road and Regent Street were cordoned off and local businesses evacuated on Friday as police investigated the bomb scare aimed at the Children and Family Court Advisory and Support Service (Cafcass).
Scotland Yard is investigating a series of suspect packages received at a number of addresses associated with the organisation throughout the UK during the course of Thursday and Friday.
It is not known who is behind the campaign or why.
Carcass represents the needs and interests of children and teenagers and is independent of the courts, social services, education and health authorities.
North Wales Police and the fire service were called to the Wrexham incident at around 0945 BST on Friday.
Traffic and shoppers were diverted away from the Cafcass building on Grosvenor Road.
"The packages are being examined and at present none have proved dangerous," said a spokeswoman for Cafcass.
"Cafcass's priority at all times is to protect staff and the children and families that visit our offices.
"We have no information as to who is responsible.
"Cafcass is clear, however, that this is an unacceptable and criminal activity which puts our staff and the families and children who visit our offices at risk and, understandably causes them distress," she added.