Oil prices slip after two days of strong increases

By Libby George LONDON (Reuters) - Oil prices fell on Friday in a sell-off following two sessions of strong rises and on caution ahead of a gathering of OPEC ministers next week in Algeria to discuss possible production cooperation to rein in global oversupply. Brent crude oil futures were down 60 cents, or 1.26 percent, at $47.05 (36.1718 pounds) a barrel, at 0903 GMT. U.S. West Texas Intermediate (WTI) crude oil futures were trading at $45.55 per barrel, down 77 cents, or 1.66 percent, from th