Story highlights Arrest made near scene of last month's terror attack

Man was arrested in 'ongoing operation,' police say

London (CNN) UK police have foiled another suspected terror attack in London, arresting a man carrying knives near the British parliament.

Armed officers from the Metropolitan Police's counter-terrorism command unit swooped on the suspect Thursday, as part of an "ongoing operation."

The 27-year-old man was arrested at 2.22pm, a few meters from the scene of a terror attack last month that left four people and the attacker dead.

Witnesses said the man was pinned to the ground on Parliament Street, within sight of the Houses of Parliament and an array of British government buildings. Downing Street, the official residence of the British Prime Minister, is a few minutes' walk away.

Firearms officers pin the suspect on the ground outside the Westminister undergound train station.

Forensics officers examined the scene outside the London Underground station at Westminster and recovered the suspect's backpack and at least two knives.

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