West Texas Intermediate crude advanced after an Israeli missile-defense test provoked war jitters in the Middle East, source of about 35 percent of the world’s oil output.

Futures climbed as much as 0.8 percent after Israel said it carried out a joint test launch with the U.S. in the Mediterranean Sea. Republican Senators John McCain of Arizona and South Carolina’s Lindsey Graham warned fellow lawmakers not to let Syrian President Bashar al-Assad’s alleged use of chemical weapons go unanswered.

WTI for October delivery rose 22 cents to $107.87 a barrel at 10:25 a.m. on the New York Mercantile Exchange. Trading was 29 percent above the 100-day average. There was no floor trading yesterday because of the U.S. Labor Day holiday, and yesterday’s electronic transactions will be booked today for settlement purposes.

Brent oil for October settlement rose 63 cents, or 0.6 percent, to $114.96 a barrel on the ICE Futures Europe exchange. Trading was 32 percent above the 100-day average. The European benchmark grade traded at a $7.09 premium to WTI.