Rome? Why the heck would they want to hit Rome? What have the Italians done to annoy Daesh?
London and Washington, fair enough...but Rome?
The Vatican, I suppose would be the only logical target there, I don't recall the Italian government doing much in Syria or Iraq in recent years.
I imagine the Vatican is well guarded though, but there's not a lot you can do to guard against such attacks as these, they are by their very definition surprise attacks.
Gatwick airport in the UK has been closed this morning, reports vary for the reason, some say that a grenade was found in someones luggage, others say that a gun was found.
Europe is going to be very jumpy for the next week or two.