She continued, \"These streets of Westminster, home to the world's oldest Parliament, are ingrained with a spirit of freedom that echoes in some of the furthest corners of the globe. And the values our Parliament represents — democracy, freedom, human rights, the rule of law — command the admiration and respect of free people everywhere.\"

May offered prayers for the victims and their families and commended the bravery of authorities during the attack \"who risk[ed] their lives to keep us safe.\"

\"Once again today, these exceptional men and women ran towards the danger even as they encouraged others to move the other way,\" she said.

\"PHOTO:
Carl Court/Getty Images
PHOTO: A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London.
>

London Mayor Sadiq Khan said in a statement, \"There will be additional armed and unarmed police officers on our streets from tonight in order to keep Londoners and all those visiting our city safe.\"

\"I want to reassure all Londoners and all our visitors not to be alarmed. Our city remains one of the safest in the world,\" he said. \"London is the greatest city in the world, and we stand together in the face of those who seek to harm us and destroy our way of life. We always have, and we always will. Londoners will never be cowed by terrorism.\"

He went on, \"My heart goes out to those who have lost loved ones and to everyone who's been affected. Tragically, a Metropolitan Police officer who was doing his duty protecting our city is amongst those who have been killed, and my thoughts are with his family this evening. I want to express my gratitude, on behalf of all Londoners, to the police and emergency services who've shown tremendous bravery in exceptionally difficult circumstances.\"

\"PHOTO:
Kirsty Wigglesworth/AP Photo
PHOTO: Armed police officers enter the Houses of Parliament in London, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside.
>

Police said a flag with the Metropolitan Police emblem is being flown at half-staff over Scotland Yard in honor of the victims.

Flag at half-mast over Scotland Yard tonight to mark the death of our officer & the other victims of this afternoon’s attack in #Westminster pic.twitter.com/NqaGSqJtmt

— Metropolitan Police (@metpoliceuk) March 22, 2017

Taylor Davis of the U.S. was at the top of the London Eye at the time of the incident.

\"We saw a lot of commotion, ambulances, policemen. We kind of thought it was a car accident at first, then a bunch of black detective cars came in a line. That's kind of when we knew it was more serious than that,\" Davis told ABC News. \"It was just surreal how lucky we felt. We felt very safe up there and just being in the right place at the right time.\"

\"PHOTO:
Niklas Hallen/AFP/Getty Images
PHOTO: People are seen inside the pods of the London Eye opposite the Houses of Parliament after an incident in central London on March 22, 2017.
>

Anyone with videos or images of the incident is asked to turn them over to police.

\"PHOTO:
Stefan Wermuth/Reuters
PHOTO: A police officer tapes off Parliament Square after reports of loud bangs, in London, Britain, March 22, 2017.
>

President Trump tweeted Wednesday night, \"Spoke to U.K. Prime Minister Theresa May today to offer condolences on the terrorist attack in London. She is strong and doing very well.\"

Spoke to U.K. Prime Minister Theresa May today to offer condolences on the terrorist attack in London. She is strong and doing very well.

— Donald J. Trump (@realDonaldTrump) March 23, 2017

And U.S. Secretary of State Rex Tillerson said in a statement, \"I express my condolences to the victims and their families. The American people send their thoughts and prayers to the people of the United Kingdom. We condemn these horrific acts of violence, and whether they were carried out by troubled individuals or by terrorists, the victims know no difference.\"

ABC News' Kelley Robinson and Kirit Radia contributed to this report.

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