The reports of an Israeli attack in Kisweh late on Tuesday emerged after U.S. President Donald Trump announced he was pulling out of the Iranian nuclear deal.

The UK-based Observatory said the missile strikes hit depots and rocket launchers, killing 15 individuals including eight Iranians. Reuters could not independently verify the report.

A commander in the regional alliance fighting alongside Damascus said that Israel had hit a Syrian army base without causing casualties.

Israel’s military declined to comment on the reports, shortly after it said it had identified “irregular activity” by Iranian forces in Syria and went onto high alert. The military had instructed authorities in the Golan Heights bordering Syria to ready bomb shelters and mobilized some reservist forces.

Iran and its ally, Lebanon’s Hezbollah, have helped Syrian President Bashar al-Assad’s military with critical support in the seven-year-old war, beating back rebels and Islamic State.

Tehran’s growing clout in Syria alarms arch foe Israel, which has struck what it describes as Iranian deployments or arms transfers to Hezbollah scores of times during the conflict.