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A YouTube video has emerged showing Israel’s controversial “knock on the roof” warning system for residents of Gaza.

What is ‘knock on the roof’?

Israel fires “warning rockets” — often sent from drones — to alert residents that a buildings has been targeted, giving them time to get out before the strike comes. It is a “time-tested strategy” for the Israeli military, the Washington Post says, and is called “roof knocking”.

Israel’s military says that air strikes target Hamas command-and-control centres, tunnels and rocket-launching pads.

The warning rocket has no warhead, and is intended only to shake the building. It is fired between three and fifteen minutes before armed missiles hit.

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