Oil prices neared $146 a barrel Thursday for the first time ever on reports of declining U.S. stockpiles and the threat of conflict with Iran.

Comments by Saudi Arabia's oil minister suggesting his country had no immediate plans to boost production also lifted prices.

Expectations that the European Central Bank will raise interest rates later Thursday could further weaken the U.S. dollar and drive oil prices even higher, as investors turn to commodities as a hedge against a falling greenback, traders said.

By midday in Europe, light, sweet crude for August delivery rose $2.28 to a record $145.85 a barrel in electronic trading on the New York Mercantile Exchange.

On Wednesday, the contract set a new closing record for floor trade at $143.57 - a full $2.60 above the previous close.

The latest spike means a barrel of crude has gone up by more than 50 percent since the end of last year, when oil was going for $96 a barrel.

In London, Brent crude futures rose to a trading record of $146.69 a barrel on the ICE Futures exchange before retreating to $146.07, up $1.81.