Documents obtained by Reuters show the U.S. government is concerned it could be implicated in potential war crimes in Yemen because of its support for a Saudi-led coalition air campaign. The Obama administration has continued to authorize weapons sales to Saudi Arabia despite warnings last year from government lawyers that it might be considered a co-belligerent under international law. This comes as a Saudi airstrike on a funeral hall in Sana’a on Saturday killed at least 140 mourners and wounded more than 500 others. Survivors spoke of back-to-back bombings during a funeral service for the father of an official with the rebel Houthi government, which controls Sana’a. We speak to Sarah Leah Whitson, executive director of Human Rights Watch’s Middle East and North Africa Division.