An arms find in the Ormeau Road area of south Belfast is believed to be linked to loyalists.
A number of weapons, ammunition, and substances thought to be explosives were recovered from a house on Burmah Street on Friday night.
Residents had to spend the night out of their homes as Army bomb experts examined the weapons.
Police have said paramilitary involvement is a line of inquiry. Three men and a woman have been arrested.
A number of other items were removed from the property for further examination.