Israel's war cabinet is due to resume debating how best to respond to Iran's attack on Sunday.
Most of the 300 missiles and drones fired towards them were shot down by its Iron Dome.
US President Joe Biden has already ruled out any involvement in Israel's response, to avoid worsening the conflict.
Reuters correspondent James MacKenzie says Israel do have the weaponry to hit back, but that wouldn't achieve much in the long run.
"There's the danger the Iranians are going to retaliate - and then you'll get into this cycle that will expand into a regional war."
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