Police are keen to speak to anyone who may have information in relation to this incident, she said.
"Our advice to anyone who may find a suspicious package is not to approach or move it but to remove themselves to a safe distance and ring 111," Dewar said.
"The agencies involved in managing such incidents have well practised systems to deal with them and minimise the risk to themselves or to the public."
The roads have not been reopened in the area.
Can you help? Anyone with information should call police on 105 quoting job number P044042842.
Information can also be provided anonymously via 0800 555 111.