[RichardCoulter]

BBC 6pm news spokeswoman said that this move by Iran is largely symbolic. Iran had to be seen to be retaliating, whilst not daring to attack the USA. Attacking a base outside America with American (and British) soldiers after making sure that the Americans had been forewarned (so that people could be evacuated) is seen as much safer than attacking the USA itself.

She ended by saying that, whether there had been any American casualties, would largely determine what Trump does next.