More than 200 oil rig workers were called to muster due to a suspected fire at a North Sea installation yesterday.
Several rescue helicopters responded to the distress call from the Brae Alpha platform, north-east of Aberdeen, when an indication of a fire was reported at around 9.10am.
All 201 personnel on the Brae Alpha installation were assembled in a safe place away from the suspected fire but no blaze was found.
Marathon Oil UK, which operates the platform, confirmed the fire and gas detection system had malfunctioned and staff were stood down from muster at 10.20am.
Aberdeen Coastguard requested two rescue helicopters from Sumburgh to assist but these were called off when they were halfway towards their destination when the false alarm became apparent.
Marathon has launched an investigation into why the detection system gave a false indication.