Mark Rowley insisted the capital would not allow terrorists to “sow discourse and fear”.
In a statement made outside Scotland Yard, Mr Rowley said more armed and unarmed police would be visible on the street.
He said: “As people are out and about today returning to the streets of the capital this morning, they will see more officers on duty armed and unarmed and a mix of metropolitan police, British transport and city of London.
We must not allow terrorists to sow discourse and fear in our city
"We’ve cancelled some leave and increased our duty hours and we’re working very hard to make sure we can reassure the public and London can go about its normal business.
“We must not allow terrorists to sow discourse and fear in our city.
“The police will stand with all communities and later today at Scotland Yard there will be a meeting of faith leaders coming together.”
London Terror Attack: Politicians react Thu, March 23, 2017
Politicians from around the world have responded to the London terror attack which led to the death of 5 people and more than 40 injured
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At least five people have been killed including a policeman and the attacker
Police have confirmed they have arrested seven people after Wednesday’s terror attack in Westminster.
Four people have been confirmed dead and 29 people treated in hospital.
Armed forces have raided six address in the capital and several arrests have been made in Birmingham believed to be linked with the London terror attacks.
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