Migrants arrive by boat at the Sicilian harbour of Pozzallo, February 15, 2015
Migrants arrive by boat at the Sicilian harbour of Pozzallo, Italy on February 15, 2015Reuters

The Islamic State (Isis) terrorist group has threatened to "flood Europe" with half a million migrants from Libya in what has been referred to as a 'psychological attack' if Western powers launch military action against the group in Libya. 

According to transcripts of telephonic conversations intercepted by authorities and published in Italy, the hardline Sunni militant group has threatened to send over 500,000 migrants simultaneously, in what would look like a biggest one-time voyage involving huge number of boats.

These migrants would b a 'psychological weapon' against Europe if Western countries launch military action the Isis in Libya, according to Mail Online.

While there will be risk of people drowning in the middle of their voyages, there are also fears that if such a mass influx of people takes place, cities in Europe will witness unprecedented riots and chaos, the report said. 

This comes close on the heels of another report on Wednesday which stated that Isis had elaborate plans to send across hardliners disguised as refugees from Libya.

British think tank – Quilliam Foundation – cited letters uploaded by Isis members on the Internet as well as documents released by the group's propagandists to reveal its plans to reach Europe via Libya.

Last week, an Isis fighter in a video showing the beheading of 21 Egyptian Christians, warned: "We will conquer Rome, by Allah's permission."

The terrorist group, which is currently at war with the US-led coalition partners, has already described the significance of Libya as a new "province" – an addition to the so called 'caliphate' that comprises large parts of Northern Iraq and Syria. The African country is now understood to be the outfit's new 'gateway' to Europe.