The Israeli US embassy said women and children were among those captured and that several hostage situations are still “ongoing”.
Both soldiers and civilians have been taken, with some being taken back over the border into Gaza – and others paraded through the streets.
At a news conference held by relatives of people still missing, parents told of harrowing phone calls they received from their children.
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‘Mummy, they shot at us’
According to Israeli officials, 1,590 people have been left injured since the incursion began on Saturday.
Meanwhile in Gaza, 413 Palestinians have been confirmed dead and 2,300 injured, according to the health ministry.
Israeli Prime Minister Benjamin Netanyahu told those still in Gaza to “leave now” as he threatened to turn it “into rubble” in response to the weekend’s attacks.