Published Wednesday, 11 January 2012
It was reported at a disused factory the Harbour Road area at around 6.50pm on Wednesday.
Firefighters found the building heavily smoke logged.
Six appliances and an aerial appliance have been called in from Warrenpoint, Portadown, Newry and Lisburn to help bring the incident under control.
Police have closed the area to traffic.
Officers say the cause of the fire "remains undetermined" and a further investigation will be carried out by the PSNI and NI Fire and Rescue Service.