Yemen fighting expands as Houthis attack Saudi airport: What to know

Saudi Arabia has vowed to respond firmly after an attack on Riyadh's international airport left at least 12 dead, with US President Donald Trump calling it 'terrible'. The Saudi-led coalition blamed Yemen's Iran-backed Houthis for the attack, which they described as a 'war crime', although the Houthis have not claimed responsibility. The Houthis issued a renewed warning against using Saudi airports, blaming the kingdom for failed interception efforts. Escalating fighting between the Houthis and Saudi-backed Yemeni forces, following the collapse of a UN-brokered ceasefire, has raised fears of a broader regional conflict.