Lebanon's Hezbollah paramilitary group and Israeli forces exchanged rocket and artillery fire on the southern Lebanon border early on Sunday, with no reported casualties on either side.
Hezbollah said that it targeted three locations in northern Israel, including an Israeli radar in the occupied Shebaa Farms "in an attempt to liberate what remains of occupied Lebanese land, in solidarity with the Palestinian resistance and people".
The exchange comes after Hamas launched an unprecedented dawn assault on Israel from Gaza by land, sea and air, accompanied by thousands of rockets fired. The attack killed at least 600 people, including at least 26 Israeli soldiers, according to the Israeli military.
Israeli strikes on Gaza since Saturday have killed at least 313 people and injured 1,990 people, the Palestinian Health Ministry in Gaza said.
Israel has imposed a crippling blockade on Gaza since 2007 after Hamas took power. The enclave is home to 2.3 million Palestinians.