Oil prices climbed for a fourth ​straight day on Wednesday as investors weighed conflicting messages from Tehran and Washington on ‌whether the Strait of Hormuz is open to ships.

Brent crude futures climbed 69 cents, or 0.8%, to $91.71, while US West Texas Intermediate crude futures were up 76 cents, or 0.9%, to $85.70 a barrel.

Both contracts closed on Tuesday at ​their highest in more than three weeks as hopes of peace between the US and Iran ​faded.

US President Donald Trump said on Tuesday no talks were taking place with Iran ⁠and insisted the Strait of Hormuz was open, contradicting Iran's assertion that the critical waterway remained shut ​to shipping.

A temporary ceasefire agreement expired on Monday and a senior Iranian official told Reuters that his country ​was moving to due to the diplomatic stalemate, though there were no reports of fresh strikes by either side on Tuesday.

"The shipping risks are increasing again as attacks from Iran and Houthis remain prevalent in both key chokepoints, ​keeping oil prices supported in the near term," said June Goh, senior oil market analyst at Sparta ​Commodities, referring to the Strait of Hormuz and Bab el-Mandeb Strait.

Read: Oil inches up as Trump threatens to bomb Oman

Shipping through Hormuz slowed, data showed on Wednesday, as most shipowners ‌avoided the ⁠key waterway due to a lack of clear signalling on its reopening from a blockade.

"However, Gulf producers are finding alternative export routes to bring oil out to the Gulf of Oman," said Goh. "If sustainable, this could help increase shut-in production from these two producers."

To avoid the Strait of Hormuz, Iraq's cabinet approved mechanisms ​for exporting Iraqi crude through specialized ​international and local companies ⁠and via multiple export outlets, the government said on Tuesday.

The contracts under the new mechanism will run for three months starting September 1, according to a ​statement issued after the cabinet meeting.

Two Chinese shipping giants have stopped sending oil tankers through Hormuz ⁠and Bab el-Mandeb amid the conflict in the Middle East and are instead collecting oil cargoes outside the Gulf.

In the US, crude oil and distillate inventories fell, while gasoline stocks rose last week, market sources said, citing data ⁠from ​the American Petroleum Institute.

Official inventory numbers from the US Energy Information ​Administration are due at 10:30am ET, with analysts polled by Reuters expecting crude stocks fell by about 600,000 barrels in the ​week ended August 14.