NEW YORK (TheStreet) -- Shares of Cobalt International Energy  (CIE) fell 6.36% to $8.68 in late afternoon trading Thursday as oil prices resumed their decline.

WTI crude prices fell to $66.50 per barrel on Thursday after a brief rebound earlier this week. Brent crude was down 0.59% to $69.51 at 3:27 p.m., according to CNBC.

One factor weighing down oil prices today is the remarks of European Central Bank president Mario Draghi, who spoke Thursday after the ECB's most recent monetary policy decision to keep rates unchanged, according to Business Insider.

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Draghi said in his remarks that declining oil prices are "unambiguously positive."

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OPEC decided last week not to cut oil production and to keep its target at 30 million barrels per day, a move that could leave the market oversupplied. The announcement sent oil prices spiraling downward, a trend that continued for much of this week.

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