Amnesty: Hundreds of Iraqi Civilians Killed in U.S. Airstrikes After Being Told Not to Flee Mosul; Yemen: Trump Expands U.S. Military Role in Saudi War as Yemenis Brace for Famine; Iona Craig on What Really Happened When U.S. Navy SEALs Stormed a Yemeni Village, Killing Dozens; U.N. Considers a Historic Ban on Nuclear Weapons, But U.S. Leads Boycott of the Talks.