AIRLINE INCIDENT: British Airways #BA179 London Heathrow to New York JFK (Boeing 777-300ER G-STBB) turned back over NW Ireland, declared Pan Pan with ATC & has just diverted to Shannon. Pilot advised ATC an indication of fire at the rear of the aircraft but unable to pinpoint the source.

Plane landed safely
What happened? You circled at 6000 feet for a while…… may be dumping the fuel .
The nature of emergency is not clear.
Experts say fake master caution light may show up during the sun set of the day affecting the fire sensors on site..