In other news
At his annual meeting, Warren Buffett has defended his daily intake of 700 calories Cherry Coke with the sort of folksy logic that has made him so appealing.
US oil output has sank by more than 100 000 barrels a day to its lowest level since September 2014 as producers cut back in the face of low prices.
For more than 10 years Dubai property prices have been on a roller coaster, creating and wiping out fortunes, but recently they appear to have run out of steam.
US stocks have declined, with the S&P 500 on pace to hold at a three-week low, amid lingering concerns that tepid global growth will weigh on the American economy.
Royal Dutch Shell announced an 89% drop in net profit for the first quarter, blamed on slumping oil prices, adding that investment would be lower than expected.
Impala Platinum will be paid $201m by a US recycling company to compensate for years of defaulted payments, the mining company says.
European and Asian stock markets have extended a global sell-off following sharp losses in New York as concerns about weak growth returned to the fore.
Randgold Resources has maintained its full-year output target as first-quarter production of the metal fell 11% after operational problems at two of its African mines.