Roof knocking

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Science and technology

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What Wikipedia says

Roof knocking (Hebrew: הקש בגג) or "knock on the roof" is a term used by the Israel Defense Forces (IDF) to describe its practice of dropping low-yield devices on the roofs of targeted civilian homes in the occupied Palestinian territories as a prior warning of imminent bombing attacks to give the inhabitants time to flee the attack.

Excerpt from the Wikipedia article “Roof knocking”, under the CC BY-SA 4.0 license. Read the article on Wikipedia