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A chilling ISIS video message has called for an "all out war" on the West with attacks in "homes, markets and roads" during Ramadan.

The message, released as the Muslim holy month begins, comes four days after 22 people were killed in the Manchester Arena bombing.

Seven kids were among those who died in Monday night's attack, carried out by a British-born terrorist with "proven" links to the Islamic State.

In the new footage, published on YouTube with the title 'Where are the lions of war', the terror group calls on followers to attack more Westerners.

It tells them to target "infidels" in Europe during the 30-day fasting period, which is observed by Muslims to celebrate Muhammad receiving the Qu'ran.

Addressed to militants and "believers" who are unable to reach the caliphate, it reads in English: "Muslim brothers in Europe who can’t reach the Islamic State lands, attack them in their homes, their markets, their roads and their forums."

In the wake of the bombing, it adds: "Do not despise the work", before telling followers: "Your targeting of the so-called civilians is beloved to us."

It also informs them: "Know that our war with our enemy is all-out war."

The sickening message, which emerged today, promises a "great reward or martyrdom in Ramadan" for those who follow it, The Telegraph reports.

It was also shared on ISiS's official 'Nashir' channels on Telegram, according to Newsweek and images posted online by terrorism expert Michael S Smith II.

(Image: Daily Post Wales) (Image: PA)

The message comes a year after the terror group's former second in command, Abu Mohammad al-Adnani, issued a similar call for terror atrocities.

Aal-Adnani, who was killed in Syria shortly after making the call to arms, urged supporters to launch attacks in Europe and the US during Ramadan.

He said at the time: "Ramadan, the month of conquest and jihad. Get prepared, be ready to make it a month of calamity everywhere for the non-believers."

That message was followed by a month of horror attacks, including the Orlando nightclub shooting on June 12, which left 49 innocent victims dead.

Outside of Europe and America, more than 300 people were killed in two car bombings in Baghdad - the deadliest attacks in Iraq since 2007.

(Image: SWNS.com)

The latest ISIS message comes after French interior minister Gerard Collomb said Manchester bomber Abedi had "proven" links with the terror group.

He also told French television that both British and French intelligence services had information that the university dropout had been in Syria.

ISIS, meanwhile, claimed responsibility for the atrocity, which occurred as fans were leaving an Ariana Grande concert at the packed arena.

The terror group said in a statement: “With Allah’s grace and support, a soldier of the Khilafah [caliphate] managed to place explosive devices in the midst of the gatherings of the crusaders in the British city of Manchester.”

(Image: Getty Images Europe)

The ninth month of the Islamic calendar, Ramadan is observed by Muslims worldwide as a month of fasting (Sawm).

It’s an incredibly sacred time for Muslims who believe that during Ramadan, the Qu'ran was revealed to mankind through the Prophet Muhammad.

Observance of it is regarded as one of the Five Pillars of Islam. It lasts 29-30 days based on the moon and changes each year because of this.

This year, Ramadan begins this evening and ends Saturday, June 24.