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ISIS fanatics have tweeted chilling photos from European cities counting down to 'zero hour.'

One of the posts reportedly shows a note in Arabic saying: ‘#Islamic State in Rome. Now is observing and locating for the target. Waiting for the zero hour.’

Others show Milan's Cathedral and an Expo Centre - while police cars appear to have been deliberately included in several photos.

(Image: Rita_Katz/twitter)

ISIS has identified Rome, which is the centre of Roman Catholicism, as a target in the past.

The group's magazine infamously published a photo of its notorious black flag flying over St Peter's Square.

The disturbing posts come amidst claims by Libya's intelligence agents that the terrorist organisation is sending fighters into Europe among migrants cross the Mediterranean.

(Image: Rita_Katz/twitter)

The north African state's Minister of Information reportedly told Italian news agency ANSA: "In the next few weeks Italy will see the arrival of boats carrying not only poor immigrants from Africa but Daesh (IS)."

It comes after it emerged that the UK would play a major role in battling people trafficking across the Mediterranean.

These latest disturbing tweets were published by the terror watch website Site, but can't be independently confirmed as posted by ISIS.

(Image: Rita_Katz/twitter)

The terror group has been battling to increase the territory it holds in Iraq and Syria and has posted numerous sickening videos of fanatics murdering hostages and captured opponents.

Earlier this month ISIS proudly posted sickening bodycam footage showing their murderous assault on civilians in the city of Ramadi in Iraq.

The horrifying video was posted on Instagram and shows a first-person view of the attack on the city of half a million people.

In one video a militant is shown firing a deadly rocket-propelled grenade, while another shows them unleash a devastating barrage from an AK-47 assault rifle.