(Human Rights Watch) – Investigating the terrible toll that the war in Yemen is inflicting on civilians has become, sadly, a regular occurrence for human rights investigators. We and others have documented scores of unlawful airstrikes by the Saudi-led coalition that have killed hundreds of civilians in Yemen. We have shown that the coalition’s blockade makes it harder to get vital humanitarian aid into the country. And we have sounded the alarm that the coalition, and the Houthi armed group it’s fighting, are accelerating the country’s march towards catastrophic famine. But then came last week’s deadly airstrike on a bus filled with children.