The Pioneer believes that Llandudno Junction industrial estate is currently closed off by 'armed police'.
According to posts seen on the Traffic, Incidents, Information Facebook page there are around six veichles at the site.
One Facebook user wrote: "Armed officers, guns out and about 6 police vehicles on tre marl ind estate just if A55 in Junction, might effect black cat roundabout soon."
Another person commented: "Llandudno Junction industrial estate is currently closed off by armed police."
North Wales Police have been approached for comment.
More to follow.