American Airlines flight AA973 landing in Bermuda due to possible fire in the cargo
 

Anyone knows what happened?

From Aviation Herald :-

Incident: American B772 near Bermuda on Feb 4th 2018, cargo smoke indication
By Simon Hradecky, created Sunday, Feb 4th 2018 16:21Z, last updated Sunday, Feb 4th 2018 16:21Z
An American Airlines Boeing 777-200, registration N757AN performing flight AA-973 (dep Feb 3rd) from New York JFK,NY (USA) to Rio de Janeiro Galeao,RJ (Brazil) with 201 people on board, was enroute at FL350 about 210nm northnorthwest of Bermuda (Bermuda) when upon establishing VHF redio contact with Bermuda area control the crew declared Mayday advising "We have indication of a fire, a cargo fire" and requested to divert to Bermuda. ATC cleared the flight direct to Bermuda. The crew descended the aircraft to 10,000 feet, the crew further advised they had indication of a fire but the temperature was cool. ATC advised that the tower at Bermuda was not staffed at the time, explained pilot controlled runway lighting to the crew and informed the crew that emergency services have been alerted and were on standby for their arrival. The aircraft landed safely on Bermuda's runway 12 about 38 minutes after leaving FL350. The passengers disembarked via mobile stairs, then emergency services on oxygen entered the aft cargo hold but did not find any trace of fire, heat or smoke.

The occurrence aircraft is still on the ground in Bermuda about 11 hours after landing.

The passengers have been rebooked onto flights back to JFK and further on to other flights to Rio de Janeiro.