OIL SLUMPS 4 PERCENT AS NO OUTPUT DEAL EXPECTED FOR OPEC
Oil prices tumbled about 4 percent on Friday on signs Saudi Arabia and arch rival Iran were making little progress in achieving preliminary agreement ahead of talks by major crude exporters next week aimed at freezing production.Also weighing on sentiment was data showing the United States was on track to add the most number of oil rigs in a quarter since the crude price crash began two years ago.