“Roof knocking” is a controversial Israeli military practice used in the Gaza Strip. It works on a simple logic designed to minimize civilian casualties. Occupants of a building are given a warning a few minutes before a military strike.

The first warning is generally a phone call. The second is a rocket.

The Israeli military has argued that the practice saves lives by giving occupants a chance to escape, but critics say the tactic creates confusion and can amount to psychological warfare. This week, the United States announced that it had used the tactic in Iraq.

(Please note: The video above has been edited – its accompanying YouTube description says the second missile actually hit five minutes after the warning missile).

U.S. military officials told reporters on Tuesday that roof-knocking had been carried out during an operation on April 5 in the Iraqi city of Mosul. The United States was targeting a building that was housing a member of the Islamic State and about $150 million in funds for the extremist group, officials said. However, a woman and children also were found to be visiting the house, raising the possibility that noncombatants could be killed in a strike.

Read More: Washington Post

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