Abu Dhabi-trained Giants Brigade fighters say "hundreds were killed and wounded on both sides" before Houthi rebels were allegedly expelled from a key district south of energy-producing Marib region.
Syrian state TV has quoted an unnamed military official as saying that most of the Israeli missiles were shot down before reaching their targets near Damascus.
Saudi-led military coalition says Iran-allied Houthis launched a ballistic missile toward Riyadh and three booby-trapped drones toward the province of Jizan, with a number of other drones being monitored.
Iran maintains that a misaligned missile battery, miscommunication between troops and their commanders and a decision to fire without authorisation are what led to the fatal downing of the jetliner.
The early-morning strike on a Syrian regime air base in central Homs province has killed at least 14 fighters, including allied Iranian forces, the Syrian Observatory for Human Rights says.
The casualties were the first in Saudi Arabia's capital since the Saudi-led war in Yemen began in March 2015, though previous rockets fired by the Yemeni rebels have caused deaths in other parts of the kingdom.
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