The man was arrested by police on The Mall outside Buckingham Palace - Photo: The Telegraph

LONDON: A man with a knife was arrested from outside the Buckingham Palace just before the Queen passed, The Telegraph reported on Wednesday.

The arrest came as soldiers were deployed outside the British parliament for guard duty after the government raised its terror threat level following an attack that killed 22 people in Manchester on Monday.

Armed soldiers will replace police at key sites under the plan announced by Prime Minister Theresa May, freeing up police resources to pursue an investigation into a possible wider network behind the attack in Manchester.