A rocket launched and shortly afterward exploded, on Tuesday. Below is passage from a news article written about it:
This was the second launch attempt for the mission. Monday evening's try was thwarted by a stray sailboat in the rocket's danger zone–ironically, the restrictions are in case of just such an accident that occurred Tuesday.
Please explain to me how ironically is used here. I don't see any irony in restricting an area for safety purposes then it turns out that place was dangerous, due to the explosion. Is there another definition or perhaps the author meant something else that I'm missing?