An investigation will try to determine why a fire-suppression system failed when a small fire broke out aboard an offshore natural gas platform off the coast of Nova Scotia.

The Deep Panuke rig 250 kilometres southeast of Halifax has yet to ramp up for production.

Energy giant EnCana Corp. says its project is now on hold following the fire and subsequent evacuation Saturday.

The platform's owner, S-B-M Offshore, says that after the fire suppression system failed, firefighters moved in to extinguished the blaze.

The spokeswoman says the electrical fire was quickly extinguished and 46 workers were removed for their safety.

The development received regulatory approval in 2007 and was initially expected to go into production by late 2010.