Israeli warplanes struck three administrative and military targets in Syria's Golan at dawn on Tuesday, killing two security guards and two women, said the Syrian Observatory for Human Rights.
"Israeli planes flying over the occupied Golan Heights launched rockets into southern Syria's Quneitra province at around 1:15 am (2215 GMT). Rockets hit Base 90 -- a Syrian military airbase -- and regime bastion Baath City. Four people were killed," the monitor said.
The strike that killed the women and guards targeted an area where the residence of Quneitra province's governor is located, said the Observatory.
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"A second strike on another area of Baath City also caused casualties, but we have been unable to confirm the number so far," Observatory director Rami Abdel Rahman told AFP.
Base 90 was also hit, he added.
The air raids came after the Israeli army said a rocket fired from Syria hit the Israeli-occupied sector of the Golan Heights, falling on open ground and causing no casualties.
The Israeli army also said it responded with artillery fire at Syrian military posts, but no mention was made of air strikes.