Houthi forces struck a training camp for pro-Saudi soldiers with ballistic missiles, killing at least 53 people. The attack is the deadliest single strike since Yemen's civil war escalated again in September. The camp held fighters aligned with the Saudi-backed side, which put it high on the Houthis' target list. Using ballistic missiles rather than rockets points to a longer-range strike. With the toll stated as at least 53, officials expect the number to climb once the wounded are fully assessed. The strike adds to a stretch of renewed fighting that began with September's escalation. Each attack of this scale raises the stakes in a war that has already lasted years.