American B772 near Norfolk on Apr 12th 2014, cargo fire indication

An American Airlines Boeing 777-200, registration N778AN performing flight AA-950 (dep Apr 11th 2014) from Sao Paulo Guarulhos,SP (Brazil) to New York JFK,NY (USA), was enroute at FL360 about 175nm eastsoutheast of Norfolk,VA (USA) when the crew received a forward cargo fire indication. The crew activated the fire suppression system in the cargo hold and decided to divert to Norfolk. Despite the discharge of the fire suppression system the fire indication continued. The aircraft landed safely on Norfolk's runway 23 about 28 minutes after leaving FL360 and stopped at the end of the runway for emergency services to check the cargo hold. Emergency services did not find any trace of fire, heat or smoke.