Global oil prices surpassed $100 a barrel on Thursday, driven by escalating attacks on shipping lanes in the Red Sea by Iran-backed Houthi rebels. This development comes as Brent crude, the international benchmark, reached $100.64 per barrel, marking a significant increase.

Red Sea Shipping Under Threat

The Houthi rebels, based in Yemen, claimed responsibility for striking two Saudi oil tankers in the Red Sea on Wednesday. These attacks directly imperil maritime traffic through the Bab el-Mandeb Strait, a crucial chokepoint that handles approximately 7% of the global oil supply, according to Oxford Economics. The strait serves as a vital conduit for international sea trade, connecting the Red Sea to the Gulf of Aden.

Market Impact and Economic Concerns

Brent crude, the international standard for oil, touched $100.64 a barrel at 10:05 a.m. ET, representing a gain of $6.57, or 7%. Concurrently, West Texas Intermediate, the U.S. benchmark, saw a rise to $91.83 a barrel, up 5.8%. This surge in crude oil prices is translating to higher gasoline costs, with the national average price reaching $4.09 per gallon on Thursday, an increase from $3.94 a week prior, as reported by AAA.

Financial markets reacted to the news, with major stock indexes experiencing declines. The S&P 500 and the Dow Jones Industrial Average both fell 1% shortly after the opening bell on Thursday, shedding 74 points and 514 points, respectively. The technology-heavy Nasdaq Composite saw a more pronounced drop of 1.8%.

Federal Reserve Policy Outlook Uncertain

The recent escalation in oil prices introduces complications for the Federal Reserve's upcoming interest rate decision, scheduled for July 29. Rising oil costs present a risk of fueling inflation, which could compel the Federal Reserve to maintain current interest rates or even consider an increase to manage price pressures, according to expert analysis. The probability of the Federal Reserve enacting a benchmark rate hike on July 29 has risen to 36%, according to CME FedWatch data, a notable increase from approximately 11% just a week ago.

"Rate cuts investors were counting on for later this year look a lot less certain today than they did even a week ago, and then they were on shaky ground," stated Nigel Green, CEO of investment firm deVere Group, in an email communication. Treasury yields also saw an upward movement amidst the higher oil prices, with the 10-year Treasury climbing to 4.71%.

Geopolitical Developments Intensify

In parallel with the maritime incidents, broader geopolitical tensions appear to be intensifying. The United States has reportedly augmented its deployment of refueling aircraft to Israel. Additionally, open-source flight-tracking data indicated the departure of American B-1 bombers from the United Kingdom. These developments follow a series of U.S. strikes on targets across Iran spanning twelve consecutive nights.

The last instance of global oil prices settling above the $100 mark occurred on May 22, according to data compiled by FactSet.