By Lefteris Papadimas and Idrees AliATHENS/WASHINGTON, July 25 (Reuters) - Air defence systems in Saudi Arabia intercepted two ballistic missiles from Yemen on Saturday targeting oil refineries in Yanbu, Greek security sources told Reuters, a day after U.S. forces launched fresh air strikes on Iran.Saudi civil defence had issued several warnings for Yanbu, on the Red Sea, and later said the danger had passed. Civil defence also issued a warning for the port city of Jizan about 1,000 km (620 miles) to the south, close to the Yemeni border.

Houthi rebels claim missile and drone attacks on Saudi oil tankers Encelia and Layla in the Red Sea following a declared maritime blockade.

Yemen's Iran-backed Houthi rebels claimed a missile attack on Saudi Arabia on Saturday as fighting between regional allies of the United States and Iran intensified on a new…