By Agence France-Presse
Saudi oil minister Khaled al-Faleh said at an economic conference in Russia that a gradual output increase could happen in the second half of the year to prevent any supply shocks, according to the RIA Novosti agency.
Benchmark crude prices tumbled almost $3 per barrel in London and fell more than $2 in New York. Oil stocks were likewise hammered as a result, with US supermajor Chevron falling 3.5 percent.
The weakened energy stocks weighed on Wall Street's performance, with the Dow Jones Industrial Average and S&P 500 each lost 0.2 percent for the day.
Russia's oil tsar Alexander Novak said ministers from OPEC and other members of the production pact would discuss how much to increase production next month.
"If we come to a common opinion that it is necessary" to increase supply it "should probably take place from the third quarter," Novak said, according to RIA Novosti.
The lackluster finish in New York came amid light trading volume ahead of a three-day holiday weekend, the traditional start of the US summer when many market players are on vacation.
Quincy Krosby, chief market strategist at Prudential Financial, said that more than simply reacting to oil prices, traders were seeking to reduce their exposure to global uncertainties ahead of the holiday.
"You don't want to stay in the market for a long weekend with the uncertainties surrounding North Korea as well as the situation in the middle-east with Iran," he told AFP.
- Geopolitical confusion -
London and Frankfurt stock indices finished the week slightly higher, while Paris was essentially flat at the close as investors hesitated amid the confusing series of reports on geopolitics.
President Donald Trump on Friday raised the possibly of pressing ahead after all with a June summit with North Korea, barely 24 hours after abruptly calling the meeting off.
That news followed on the heels of the Trump administration's announcement it was considering imposing duties on auto imports, which threatens to disrupt a crucial North American industry and anger major US trading partners who are already in fraught trade talks with Washington.
US markets will be closed on Monday in observance of Memorial Day.
Asian markets mostly fell Friday after the news of Trump's cancellation of the summit.
"It looks like we are back to fire and fury as the modus operandi for the White House again after President Trump (threatened) a new 25 percent car import tariff and cancelled the summit with North Korea," said Greg McKenna, chief market strategist at AxiTrader.
Key figures around 2100 GMT
New York - Dow: DOWN 0.2 percent at 24,751.44 (close)
New York - S&P 500: DOWN 0.2 percent at 2,721.26 (close)
New York - Nasdaq: UP 0.1 percent at 7,433.85 (close)
London - FTSE 100: UP 0.18 percent at 7,730.28 points (close)
Paris - CAC 40: DOWN 0.1 percent at 5,542.55 (close)
Frankfurt - DAX 30: UP 0.65 percent at 12,938.01 (close)
EURO STOXX 50: DOWN 0.18 percent at 3,515.36 (close)
Tokyo - Nikkei 225: UP 0.1 percent at 22,450.79 (close)
Hong Kong - Hang Seng: DOWN 0.6 percent at 30,588.04 (close)
Shanghai - Composite: DOWN 0.4 percent at 3,141.30 (close)
Euro/dollar: DOWN at $1.1661 from $1.1720 at 2100 GMT
Pound/dollar: DOWN at $1.3312 from $1.3381
Dollar/yen: UP at 109.55 yen from 109.26 yen
Oil - Brent North Sea: DOWN $2.35 at $76.44 per barrel
Oil - West Texas Intermediate: DOWN $2.83 at $67.88