Libya is across the Mediterranean Sea from Italy. Italy's Interior Minister Angelino Alfano later urged NATO to intervene "for the future of the Western world." Alfano added: "ISIS is at the door. There is no time to waste."
But while Italian authorities deployed 5,000 troops to guard embassies and monuments across the country, many on Twitter saw the funny side of ISIS' threats. The hashtag #we_are_coming_o_rome trended for days.
("Passamontagna" is the Italian word for "balaclava.")
ISIS supporters did not do themselves any favors by either misspelling threats, or mistaking a famous Italian dish with a medieval town.
One self-proclaimed “citizen and soldier of the Islamic State” wrote: “We will use your leaning tower of pizza to throw off homosexual,” seemingly unaware that the world-famous structure is in Pisa and is not made of dough.
The Twitter account was later suspended but that didn't stop a torrent of sarcastic replies.
What other things better to throw off 'Leaning Tower of PIZZA' Smoked Salmon Parmesan Mushrooms Prawns Pineapples Damn I'm hungry now