Syrian military positions were targeted early on Thursday after an unmanned drone entered Israeli airspace from Syria the day before.
Both the Syrian Observatory for Human Rights and Syria's opposition said the air strikes were carried out by Russian war planes.
The southwest, bordering Jordan and the Israeli-occupied Golan Heights, is one of the remaining parts of Syria still outside the control of the state after seven years of conflict.
The weaponisation of propaganda on Syria has gone from a cottage industry to a mainstream scourge. Does the propaganda enable the Assad regime's crimes?
Syrian regime media first reported that missiles were fired at the Shayrat air base near Homs and an air base in the capital Damascus. However state TV later said a false alarm had triggered air defence systems, and there was no attack.
UN human rights chief says the Syrian regime's five-year siege of the Damascus suburbs of eastern Ghouta included the use of chemical weapons and starvation. UNHCR says almost 50,000 have fled the enclave in recent days.
After seven years of war it can be easy to forget why Syrians rose up against Bashar al Assad in the first place. This is the story of one man's life under Baath Party rule in Syria.
As dozens of aid trucks remain unable to enter the besieged enclave of eastern Ghouta, the UN Human Rights Council postponed voting on a British resolution condemning the crisis, after member states failed to agree on a final text.
Hundreds killed, including women and children, in one week as Syrian regime forces and its allies carried out the heaviest bombardment of the year in Syria's rebel-held enclave of eastern Ghouta.
Sweden and Kuwait call for a vote on Thursday on a UN resolution ordering a 30-day ceasefire throughout Syria to allow the delivery of aid and evacuations.
The pro-regime militants consisted of a convoy of 20 vehicles that departed from the Nubl al Zahraa region and tried to advance into Afrin region.
Syrian peace talks in Sochi got off to a rocky start, but some headway made between regime and opposition delegates.
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