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Terror tyrant Abu Muhammad al Adnani last month told the West to get ready for a "month of calamity everywhere for the non-believers".

And this week US terror brainboxes say lone-wolf extremists could respond to the "call to martyrdom" during and after the holy period.

"Sacrifice during Ramadan can be considered more valuable than that made at other times, so a call to martyrdom during the month may hold a special allure," said the report, by the Overseas Security Advisory Council (OSAC).

"Calls for Ramadan attacks by ISIS may inspire unaffiliated lone wolves who generally require less time for planning.

"While Ramadan could be an added impetus for terrorists to carry out attacks against perceived enemies in Europe, the threats are unlikely to stop when the month comes to a close."

(Image: PA)

An audio recording released on May 21 heard Daesh doughnut Adnani saying: "Ramadan, the month of conquest and jihad."

He urged jihadists to conduct lone-wolf attacks for a "great reward of martyrdom" and said ISIS wanted to "punish the crusaders day and night".

England Euro 2016 fans dressed as crusaders have been warned they could be ISIS targets and a Whitehall insider said ISIS are planning a chemical weapons blitz on English footie supporters.

The OSAC report said the recent threat could be credible because ISIS carried out the "Black Friday" catastrophes three days after Adnani's Ramadan call to arms last year.

(Image: GETTY)

More than 403 people died on June 26, 2015, in the Tunisian beach resort shooting, the Shia mosque bombing in Kuwait, the Kobani massacre in Syria, another Syria suicide bombing in Al-Hasakeh, the African soldiers slaughter in Somalia and the factory beheading at Saint-Quentin-Fallavier in France.

Blood-thirsty Boko Haram terrorists followed suit with Ramadan attacks in Nigeria.

Ramadan runs from this Monday, June 6, to July 5 – overlapping with Euro 2016 between June 10 and July 10.

(Image: GETTY) (Image: NC)

The report said there is no information suggesting an ISIS attack is being planned.

Ramadan is a period of fasting for Muslims and is held each year during the ninth month of the Islamic lunar calendar.

ISIS declared its so-called Islamic caliphate during Ramadan in 2014.

The report also said ISIS could launch attacks during the evening lftar meals of Ramadan.

The US Department of Homeland Security warned its citizens that ISIS could carry out attacks at the Euros and at the Catholic World Youth Day in Krakow, Poland, on July 26.

A CIA spokesman declined to comment to the Washington Free Beacon newspaper over the Ramadan threat while the Homeland department did not respond to requests for comment.