Police, fire crews and an Explosive Ordnance Disposal team were called to an address in the Ross Place area at about 20:20.
A small number of residents were evacuated from the premises but have now returned to their homes.
A 17-year-old man has been detained in relation to a separate matter.
Police said no-one was injured and at no time was there any danger to the public.
Bomb disposal experts were called to an incident at a block of flats in Fort William on Friday evening after an "unidentified device" was found.