Israel bombs Syria after rockets fired at Golan Heights
The Syrian Observatory for Human Rights said rockets were fired at Israel from positions around the capital held by groups loyal to the Damascus regime.
Read more: Baha Abu al-Ata: Who was the secretive Islamic Jihad leader assassinated by Israel?
It gave no further details but the Observatory reported "missile fire by Israeli aircraft on positions south and southwest of Damascus".
Syrian air defences opened fire in response, the UK-based war monitor said.
"The Israeli bombardment targeted positions held by pro-regime groups who launched the missiles against Israel," Observatory head Rami Abdel Rahman told AFP.
The flareup comes after a major escalation in-and-around Gaza last week following Israel's targeted killing of a commander of Palestinian militant group Islamic Jihad, which is allied with Damascus.
The killing was accompanied by a second strike, unconfirmed by Israel, on an Islamic Jihad leader in Damascus that killed his son and another person.
There was no immediate rocket fire from Syria following that strike.
Israel has carried out frequent air and missile strikes against targets inside Syria since the country descended into civil war in 2011.
Most have been against what Israel said were Iranian targets or positions of Iran's Lebanese ally, Shia militant group Hezbollah.
Israel has also carried out some strikes targeting Palestinian rejectionist factions based in Damascus, like last week's strike that Islamic Jihad said targeted one of its leaders.
Islamic Jihad joined other militant groups in agreeing a fragile new UN- and Egyptian-brokered truce around Gaza after last week's two-day flareup.
It came after senior Islamic Jihad leader Baha Abu al-Ata, whom Israel blamed for recent rocket fire into its territory, was killed in a strike on his home in Gaza City.
In response Islamic Jihad, which is allied with Gaza's rulers Hamas, fired around 450 rockets towards Israel, which struck back with more airstrikes.
The flareup saw 34 Palestinians and no Israelis killed.
A ceasefire between Israel and militant groups including Islamic Jihad was agreed after 50 hours of clashes, but the deal remains precarious.