On Sunday the IDF said Islamic Jihad had launched nearly 1,500 rockets towards Israel between Wednesday and Saturday.
A rocket launched from Gaza killed a Palestinian man working in Israel and seriously wounded another, Israel medical authorities said.
In a separate incident, clashes also took place on Saturday morning in the occupied West Bank and at least two Palestinian men were killed, Palestinian officials said.
The latest flare-up began on Tuesday, with the IDF launching strikes on Islamic Jihad, a Palestinian militant group it accuses of planning attacks against Israel.
It is the third conflict in as many years between Israel and Palestinian militants in Gaza, including Hamas, the largest armed group in the enclave, and Islamic Jihad, the second largest.