I'd rather see a warning that an attack is imminent - rather than see a report that an attack occurred.
In this case, it looks like the system worked.
May God keep us all safe from ourselves.
So why wouldn't the conspirators wait until then, when the airline security bar on international flights will inevitably be lowered?
It appears the execution of the plot was imminent, so my guess is that a) jihadists find it difficult to alter long-range plans and b) the tourist season is in full swing in August, overtaxing whatever security exists, and c) 'tis also the season of foreign student visa holders checking in for the fall college term -- or not checking in, as per the 11 wandering Egyptians.