Shares in US energy companies have jumped as investors bet that the US seizure of Venezuelan President Nicolás Maduro will open opportunities to tap the country's oil reserves.
Shares in Chevron opened more than 4% higher, after surging more than 7% in pre-market trading, while other firms, including ConocoPhillips and Exxon also gained.
Precious metal prices and shares in defence stocks also rose as the intervention increased investors' concerns about geopolitical risks.
Gold was about 1.9% higher at $4,412 (£3,275) an ounce, while the price of silver was up by 3.6%, as money was moved into so-called "safe-haven" assets.
Prices of precious metals such as gold and silver often rise in times of uncertainty as they are seen as safer assets to hold.
The gold price saw its best annual performance last year since 1979 after rising by more than 60%, reaching an all-time high of $4,549.71 on 26 December.
Those gains were driven by several factors including expectations of more interest rate cuts, major purchases of bullion by central banks and investor concerns about global tensions and economic uncertainty.
Oil prices fluctuated on Monday as investors weighed whether Washington's intervention in Venezuela would affect crude supplies.
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