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British police said on Sunday they had arrested a second man in connection with an attack in London two days earlier, in which a terrorist suspect assaulted officers with a 1.5-meter (4-foot) sword.
"The man was arrested on suspicion of being involved in the commission, preparation or instigation of terrorism at 10:15 a.m. (0915 UTC) today and he has been taken into custody," they said in a statement.
Police had earlier stated their belief that the attacker was acting alone.
British counterterrorism police launched their investigation after a man was arrested on Friday for the sword attack on officers outside Buckingham Palace. He had previously driven a car at police outside the palace, which is often used as a residence by Queen Elizabeth II and her family..