Children 'mercilessly' killed by Hamas in Israel massacre - as Gaza is pummelled

The unprecedented response promised by Israel in the wake of the weekend's atrocities has now well and truly clicked into gear.

Earlier, the Israeli military said it had secured the border with Gaza, which is now under the heaviest bombardment in its history

Meanwhile, residents in the Israeli city of Ashkelon - close to that border - were warned to take shelter by Hamas militants.

A salvo of rocket fire then followed, the extent of the damage is still unclear.

Our Foreign Affairs Correspondent Secunder Kermani has been to the Kfar Aza kibbutz - one of those targeted by the militants on Saturday.

Credits @Channel 4 news