A radical Christian terror group calling itself the Sons of Jesus has claimed responsibility for the Egyptian mosque bombing in late November, but the claim has inspired skepticism among terror analysts, who believe the attribution — and the group itself — may be a rare example of an ISIS false flag.

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In what has become known as Egypt’s most destructive terror attack in recent history, 25 to 30 militants detonated a bomb inside the Al Rawda Sufi mosque in the small town of Bir al-Abed on Nov. 24 and began firing at worshipers fleeing the scene. The attack left 311 worshipers dead and 128 more injured.

Several hours after the massacre had taken place, the Egyptian military hit back with airstrikes against militants in four-wheel-drive vehicles close to Bir al-Abed.

Nabil Sadek, Egypt’s chief prosecutor, stated that the militants were carrying an ISIS flag during the attack, and yet, ISIS has still not claimed responsibility for the atrocity, despite the fact that the terror group has had its sights set on the area before.

Local terror group Ansar Beit al-Maqdis, which changed its name to the Sinai Province group after pledging allegiance to ISIS in November 2014, killed Sufis in the exact same region. One of its commanders condemned Sufis in a January 2016 interview for engaging in “sorcery and soothsaying.”

ISIS itself believes that Sufism is a “disease,” and the group has a history of destroying Sufi shrines in acts of self-described purification.

As such, all signs point to ISIS as being the originator of the attack, but instead of rushing to claim responsibility, pro-ISIS channels have been spreading a poster purporting to be from the Sons of Jesus, a new radical Christian terror group. The following poster announced the existence of Harakat Abna Yeshua (the Sons of Jesus) and included a claim of responsibility for the devastating mosque attack in the Sinai region, which left 311 dead. The purported group declared that “Muslim terrorists” will be the target of future attacks for as long as they continue to assault Christians.