The problem is that one bomb going of could rapidly lead to 100's - who is to say it's an accident and not a strike? Wouldn't the enemy pretend it was an accide

The problem is that one bomb going of could rapidly lead to 100's - who is to say it's an accident and not a strike? Wouldn't the enemy pretend it was an accident? Why are they moving forces now? (because they realise that a bomb just went off...)