The evidence was there, plain as it could be: there was no hiding. A bomb made in the US by the famous US manufacturer Lockheed Martin. This bomb was sold as part of a US State Department-sanctioned arms deal with Saudi Arabia. And not just any bomb. A 500-pound, 227 kilogram laser-guided one. 40 school children dead as a result, one of many incidents involving US bombs and civilian deaths in Yemen.

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