Oil Zooms Back Above $35

Updated from 3:10 p.m. EDT

Crude oil prices jumped back above $35 Friday, at the end of a volatile week that saw prices soar to 10-year highs despite an agreement from the Organization of Petroleum Exporting Countries to boost supplies.

Industry analysts blame price volatility in part on mixed messages from OPEC, whose president was reported as saying that prices could still hit $40 a barrel despite the cartel's decision Sunday to boost its output ceiling by about 800,000 barrels a day next month to ease prices.

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