New York

US gas prices jumped to an average of USD 4 a gallon again Monday as the US and Iran launched more attacks.

According to motor club federation AAA, the national average for a gallon of regular gasoline is now back to USD 4. The average price a year ago was USD 3.14 a gallon.

The price is a national average, meaning drivers in some states have been paying well over USD 4 a gallon for a while now, while others pay less. Prices vary between states due to factors ranging from nearby supply to differing tax rates.

People around the world are also dealing with high gas prices as a result of the war.

Gas prices first went over USD 4 a gallon on average at the end of March. They dipped below that in mid-June and continued to fall as crude oil prices eased when the US and Iran reached an interim deal. Even then, President Donald Trump expressed frustration that gas prices weren't falling as quickly as oil prices.

Affordability is likely to be a key issue for voters in the US midterm elections, and higher gas and oil prices can help push up prices for groceries and other goods.

Oil prices have climbed again in recent days as the US and Iran move closer to resuming an all-out war.

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Brent crude, the international standard, rose 3.2 per cent to USD 90.95 per barrel Monday and benchmark US crude climbed 2.8 per cent to USD 84.04 per barrel.