Islamic State sympathizers are reportedly celebrating the latest attacks to shake the United Kingdom online.

Attackers slammed a van into pedestrians on London Bridge late Saturday evening. The incident was immediately followed by a string of stabbings at Borough Market nearby. Pro-ISIS channels are heralding the attacks as “the black days we’ve promised” and are anticipating an ISIS claim, reports the SITE Intel Group, which monitors jihadi activity worldwide.

6)Pro-#ISIS channels continue to celebrate #LondonAttack as”the black days we’ve promised”,the wolves have awakened”responding to ISIS calls pic.twitter.com/4uqWKBHEAt — Rita Katz (@Rita_Katz) June 4, 2017

ISIS claimed responsibility for the bombing in Manchester that killed almost two dozen people and injured numerous others. In the wake of the attack, ISIS warned that “what comes next will be more severe on the worshipers of the Cross and their allies,” and in this month’s magazine, ISIS said that another terrorist attack in Britain was inevitable.

No specific group has announced that it was behind the London attacks, yet ISIS sympathizers have been celebrating for hours.

2)No claim reg #LondonBridge, but #ISIS accounts are celebrating the attack similar to after #manchesterattack: Publishing images, warnings pic.twitter.com/998B8zviZd — Rita Katz (@Rita_Katz) June 3, 2017

Pro-ISIS accounts were particularly active in the immediate aftermath of the Manchester attack as well. Sympathizers encouraged jihadis to “hunt your prey” in the U.K.

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