So he wasn't a lone wolf then. From the Telegraph
Scotland Yard has arrested a second man after the suspected terror attack outside Buckingham Palace on Friday night. The unnamed 30-year-old was seized at a West London address on suspicion of being involved in the commission, preparation or instigation of terrorism.
A 26-year-old man from Luton was arrested outside Buckingham Palace late on Friday after he drove at police before lunging for a 4ft sword and repeatedly shouting “Allahu Akbar”.
The attacker is also being held under terrorism legislation and a warrant for his further detention has been granted.
Scotland Yard initially said they were not seeking anyone else in connection with the attack.
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