Medics in the besieged Palestinian enclave reported five Israeli airstrikes on Rafah early on Thursday that hit at least three houses, killing at least six people including a local journalist
There were no immediate reports of damage or casualties. Israeli media reported that some of the rockets had been intercepted by Israel's Iron Dome defence system.
The Israeli military said sirens had sounded in the Upper Galilee in northern Israel, and in the Golan Heights, part of territory Israel captured in the 1967 Middle East war.
Rockets fired from Lebanon two days ago drew retaliatory Israeli shelling and air strikes, in an escalation of cross-border hostilities amid friction with Iran.