British police say a man had been arrested after armed officers were seen on Whitehall, the street home to numerous government ministries in central London, with a BBC reporter saying two knives had been seen.
Police said no one had been injured in the incident on Thursday but gave no further details.
A BBC Home Affairs correspondent said on Twitter that two knives had been seen on the ground including a large "breadknife".
British police have also closed the main gates to parliament a Reuters witness said.
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