Israel's 'knock on roof' airstrike warning as it happens

Israeli military forces use a "knock on roof" warning system in Gaza, to alert some residents when an airstrike is imminent.

Footage posted on YouTube by the Gaza-based Watania news agency apparently shows the controversial technique in action, with a small missile hitting the roof of what appears to be a residential building in the region. This is a "roof knock" warning.

Just over one minute later a rocket strike is blasted into the entire building, which the agency said was home to a man called Samir Nofal and his family.

In this instance the Israeli military had also provided a 15-minute phone warning ahead of the strikes and the Nofal family were able to warn neighbours and evacuate the building safely before the rockets hit.

More: Gaza death toll reaches 172, say Palestinian officials

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Israel launches ground offensive in Gaza as air strikes continue

Israel has launched a ground offensive in Gaza with residents reporting heavy shelling in the area. Palestinian health officials say 27 Palestinians, including a baby, two children and a 70-year-old woman, have been killed since Israel sent ground forces into the densely-populated strip of 1.8 million Palestinians.