from avherald.com
A Singapore Airlines Cargo Boeing 747-400 freighter, registration 9V-SCA performing freight flight SQ-7866 from Taipei (Taiwan) to Tokyo Narita (Japan) with 4 crew, was enroute near Okinawa Island about one hour into the flight when the crew reported they had a fire alert on board and decided to divert to Naha (Japan) on Okinawa Island. The aircraft landed safely at Naha Airport about 30 minutes later, attending emergency services found no trace of fire.
The runway was closed for about 20 minutes. The cause of the fire alert is under investigation.
Note: This is SQC's first and just recently converted BCF (ex. 9V-SPA). Not the first time I hear of false cargo hold fire warning's on the BCF.