"A Saudi Arabian Airlines Boeing 777-200, registration HZ-AKA performing flight SV-104 from London Heathrow,EN (UK) to Riyadh (Saudi Arabia), was climbing through FL240 out of London Heathrow about 60nm east of the airport when the crew received a forward cargo fire indication, activated the fire suppression system, declared emergency and returned to London Heathrow for a safe landing on runway 27R about 18 minutes later.
Maintenance found chafed wires in the forward cargo hold had caused a short circuit and an actual fire in the cargo hold.
The airplane was able to depart again after 3 hours on the ground and reached Riyadh with a delay of 3:20 hours."From:
http://www.avherald.com/h?article=43219f5e&opt=0Pics with article as well. Could have been a very bad situation. Nice job by the crew!