Israel is reported to have carried out a missile strike on a military outpost south of the Syrian capital, Damascus.
Syria’s state news agency Sana said two missiles were shot down in the Kiswah area on Tuesday night, and that two civilians were killed in an explosion.
But a monitoring group said the missiles hit an Iranian weapons depot, killing 15 pro-government fighters.
Israel declined to comment. But the reports came after it noted “irregular activity” by Iranian forces in Syria.
The Israeli military placed its troops in the occupied Golan Heights on high alert and urged civilians to prepare bomb shelters.
Israeli Prime Minister Benjamin Netanyahu meanwhile flew to Moscow to discuss Syria with Russian President Vladimir Putin, a key ally of the Syrian government.