Saudi Arabia’s offer to send ground troops into Syria comes as the U.S. ally faces closer scrutiny over its bombing campaign in Yemen. On Saturday night, a Saudi-led airstrike hit a sewing factory and electronics warehouse in the Yemeni capital Sana’a, reportedly killing 18 people, including a 13-year-old boy. Human Rights Watch has released new evidence the U.S.-backed, Saudi-led coalition is using internationally banned cluster munitions supplied by the United States. Cluster bombs are designed to fan out over a wide area, and their submunitions often fail to explode, posing a massive risk to civilians.