An ageing floating storage and offloading unit (FSO) laid-up off Yemen has started leaking oil.

The 407,000-dwt Safer (built 1976) has been described as a "floating bomb" by environmentalists.

Built in Japan and owned by Yemen's Safer E&P Operation Company, it is anchored off Ras Isa with 1.2m barrels of crude on board.

Houthi rebels have called for help as crude escapes into the Red Sea.