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A British ISIS leader in Syria is secretly using Facebook to lure new recruits into carrying out terrorist attacks in the UK, an investigation has discovered.

An account on the social network is being used by Omar Hussain, a former Morrisons security guard, to encourage others to act in the name of ISIS .

Hussain is a convicted sex offender who fled to Syria in 2013 from High Wycombe in Buckinghamshire and has featured in an official IS propaganda video.

Posts on his new Facebook account declared the UK to be “a land of war” where Muslims are under attack and claimed that jihad in retaliation is compulsory.

He said: “In Islam there is only Dar Al-Islam [Land of Islam] and Dar Al-Kufr [Non-belief] (also referred to as Dar Al-Harb [War]).”

(Image: Getty)

Hussain added: “The UK (and the west generally) is in fact at WAR with Islam and the Muslims, as is attested to by the thousands of bombs that have been dropped in Muslim lands and the thousands of brothers they have locked up for no reason other than their love for the return of the Shari’ah.

“Anyone who believes the West is at peace with Muslims has not understood the concept of brotherhood or he lacks knowledge of the reality (whether intentionally or arrogantly).”

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In the previous post, he said: “QUESTION: How Many conditions has Allaah laid down…before jihad becomes obligatory?”

He added: “And the answer is... None! Jihad becomes fard [obligatory] when Muslims are under attack. Simple as.”

(Image: TIM STEWART)

Hussain, who uses the name Abu Sa’eed Al-Britani, also slammed refugees fleeing war-torn Syria: “Anyone who flees from Dar Al-Islam to Dar Al-Kufr has committed a major sin.

“These refugees who flee to Europe and elsewhere have NO RESPECT in the eyes of the Syrians who chose to remain in Dar Al-Islam.

“They abandoned Dar Al-Islam & they abandoned jihad... Such men deserve no respect whatsoever.”

One Facebook post included a picture of a gathering inside a building in front of a projection screen, which Hussain said was showing ISIS videos.

He said: “Imagine walking in a masjid [mosque] and watching the latest dawlah [ISIS] videos? Only in Sham [Syria]!”

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Hussain also criticised Muslims who are against ISIS and agreed that they jihadists should be arrested, accused people of being hypocrites.

“Anyone who is pleased with the arrest of a fellow brother or sister is nothing short of a munafiq [hypocrite],” he claimed.

He added: “Amazing how submissive Muslims have become to the Kuffaar [non-Muslims]. How easily we allow them to take our sisters.... Sad times.”

Hussain is believed to be one of around ten Britons in Syria who are on a RAF kill list due to their involvement in recruitment or planning of terror attacks.

He was unmasked as being behind a fundraising drive that is funnelling cash from IS supporters in the UK to Syria via a network of agents exploiting high street money transfer services.

Hussain was convicted of sexual assault after he was caught on CCTV at the age of 21 as he cycled up to a woman in the street and fondled her breasts.

He studied to teach English as a second language before he travelled to Syria with another man from High Wycombe in December 2013.