Tensions are escalating between Saudi Arabia and Iran following a missile attack on the Saudi capital Riyadh.
Saudi air defences intercepted the ballistic missile in the skies over the city in an incident that is jangling nerves across the region.
The attack comes the week after the Trump administration presented evidence it says shows Iran supplied another missile launched at Riyadh’s international airport last month.
And it comes as a video has gone viral, apparently made in Saudi Arabia, which visualises open conflict between the two sides.
So what is going on?
Saudi Arabia and Iran back opposing sides in neighbouring Yemen’s nasty civil war.