Residents of Damascus have been sensitive to booming sounds since a suspected Israeli bombardment targeted an Iranian embassy building in the Syrian capital earlier this week, a war monitor reported on Saturday.
On Monday, two brigadier generals and five other members of Iran's Islamic Revolutionary Guard Corps (IRGC) were killed in an airstrike on the Iranian embassy compound in Damascus, triggering vows of retribution from Tehran.
Israel has not commented on the incident.
Residents of Damascus have since been panicked by any powerful sounds, according to the Syrian Observatory for Human Rights.
This was the case on Saturday when sounds boomed resulting from government ground defences reacting to suspected objects over rural areas outside Damascus, the Britain-based observatory said.
Earlier, sounds of explosions were heard after government military engineers defused war explosives in Damascus suburbs.
The sounds struck panic into the locals, who thought they were the result of an attempt by the Syrian army to repulse an Israeli missile attack, said the watchdog that has been documenting violence in Syria since the civil war erupted there in 2011.
Israel has carried out 32 attacks in war-torn Syria including 15 in and around Damascus so far this year, according to the observatory.
Israel has been bombing targets in Syria with the goal of hitting IRGC personnel and pro-Iranian militias, including the Lebanese Hezbollah movement, based there.
Israel aims to prevent Iran and its allied militias from expanding their military influence in Syria.
Israeli attacks on Syria have increased since the Gaza war began in October last year.