crude benchmarks rose for a fifth week in a row, gaining around 2% this week. Prices were up more than 10% so far this year on concerns over tightening supplies.

Brent futures fell 49 cents, or 0.6%, to settle at $87.89 a barrel, while U.S. West Texas Intermediate (WTI) crude fell 41 cents, or 0.5%, to settle at $85.14.

Earlier in the week, both Brent and WTI rose to their highest levels since October 2014.

“The latest pullback is most likely due to a combination of pre-weekend profit-taking and the absence of fresh bullish catalysts,” said PVM analyst Stephen Brennock, noting Thursday’s bearish data from the Energy Information Administration (EIA).

The EIA reported the first U.S. stock build since November and gasoline inventories at an 11-month high, against industry expectations.

Other analysts also said they expect the current pressure on prices to be limited owing to supply concerns and rising demand.

OPEC+, which groups the Organization of the Petroleum Exporting Countries (OPEC) with Russia and other producers, is struggling to hit its monthly output increase target of 400,000 barrels per day (bpd).

In the United States, energy firms cut oil rigs this week for the first time in 13 weeks.

Tensions in Eastern Europe and the Middle East are also heightening fears of supply disruption.