According to media reports 3 US soldiers killed by drones in Jordan.
Additionally more than 30 soldiers were injured in the attack, and some of them were seriously injured, had to be evacuated.
Usually the US bases have sufficient protection against attacking drones which are destroyed before they can cause damage.
In this case, the attacking drone was not detected before it caused damage.
One of the reasons why the drone was not detected could be that the drone was flying at a very low height
Iran has denied its involvement in attacking the US base.