The seventy-fourth edition of al-Naba, the Islamic State’s newsletter, released online on 30 March 2017, reiterated the terrorist group’s 23 March claim via Amaq of the 22 March Westminster attack by Khalid Masood (born: Adrian Russell Ajao). The brief article is reproduced below.
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One of the Soldiers of the Caliphate Killed and Wounded Crusaders in London
News — Britain
On Wednesday (23 Jumada Al-Akhira [1438 Hijri; 22 March 2017]), 44 crusaders were killed and wounded by an Islamic State soldier’s operation that run over and stabbed them near the headquarters of the Crusader Parliament in central London.
The brother Khalid Masood—may God have mercy on him—drove a car over Westminster Bridge and then stormed the courtyard of the parliament and stabbed a British police officer before he was made a martyr—as we think—by gunshots from the Crusader police.
The attack killed 5 crusaders and injured more than 39 others, thanks be to God.
This is the first attack carried out by the soldiers of the Islamic State in Crusader Britain, which is considered one of the most important pillars of the crusader alliance against the Islamic State.
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 This is not actually the first attack by the Islamic State in Britain. Since 2014, there have been five thwarted Islamic State attacks, and two “successful” attacks—the London tube attacker, Muhiddin Mire, who was inspired by the Islamic State, and Mohammed Abdul Kadir and Mohammed Hussain Syeedy, the assassins of the Rochdale imam, Jalal Uddin, whom they accused of heresy. It is not even the first claimed attack by the Islamic State movement: the 30 June 2007 attack at the Glasgow Airport by Bilal Abdullah and Kafeel Ahmed was claimed by the military emir and deputy, Abdul Munim al-Badawi (Abu Hamza al-Muhajir), in a speech on 24 October 2008.