By Enas Alashray and Idrees Ali CAIRO/WASHINGTON, Sept 9 (Reuters) - Iran's Revolutionary Guard said it fired ballistic missiles at a base in Jordan used by the U.S. military and attacked 10 ships on Wednesday,

Iran used its new electro-optical missiles for the first time in an attempted attack on US warships on Wednesday, officials claimed, as part of Tehran’s retaliation campaign against American vessels in the region.

The price of Brent crude, the international standard for oil, added 67 cents, reaching $96.95 per barrel. In the U.S., the average price of regular gas was $4.14 a gallon going into Labor Day weekend, nearly a dollar higher than last year and a record for any Labor Day weekend

Iran threatened the United States with "economic warfare" on Tuesday and said it had fired an advanced missile at U.S. warships, underscoring the risks of further escalation in ​the war only days after both sides traded blows again.

Houthi missiles and drones struck Aramco facilities across Saudi Arabia, threatening to squeeze both the Strait of Hormuz and Bab el-Mandeb.

Delegations from the U.S. and Iran entered negotiations in June aimed at a war-ending deal based on a memorandum of understanding signed by both countries. The U.S. and Iran have nonetheless continued to exchange strikes,