Giant yellow bollards have been installed near Buckingham Palace as police tighten security around London's landmarks.
The large structures have been erected along with a steel wall on the Mall as the capital recovers from a terror attack at the heart of the city .
A Scotland Yard spokesman said: "It's security measures put in place but not in response to any threat.
"Buckingham Palace is obviously a high profile area that is going to benefit from them.
"There is no intelligence to suggest a threat to these spots."
The measures coincide with blast and bullet resistant trucks being stationed in Westminster as police officer numbers double as a safety precaution. They are patrolling major tourist spots and stations.
Weighing seven tonnes, the monster trucks have wheels that are resistant to bullets and a steel floor protecting occupants from bomb explosions.
The surge in the number of armed and unarmed officers was announced by the Metropolitan Police to reassure Londoners following last week's atrocities, in which four people died and around 50 were injured .
Khalid Masood drove along the northern pavement of Westminster Bridge just before 3pm last Wednesday (March 22).
A total of 12 people have been arrested as part of the investigation. Nine have been released with no further action.
Police have revealed the attack lasted 82 seconds before Masood was shot dead.
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