Prime Minister Theresa May this evening condemned the "sick and depraved terrorist attack" in Westminster earlier today.
May, who earlier chaired a meeting of the government's Cobra committee, said details of what happened were still emerging.
But in a speech in Downing Street this evening, she confirmed the actions were of a single male attacker who had driven his vehicle into pedestrians on Westminster Bridge, killing two people in the process, before running towards Parliament.
Our thoughts and prayers go out to all who have been affected – to the victims themselves, and their family and friends who waved their loved ones off, but will not now be welcoming them home.
At least 20 people on Westminster Bridge were also injured, which included three police officers.
The attacker rushed towards parliament with eye-witnesses saying he was brandishing an eight inch knife. After being denied entry by police the individual was shot and reportedly died later in hospital.
May said the terror threat level will not be altered because it has been at "severe for some time" in the UK and May urged Londoners to "get up and go about their day as normal".
They will board their trains, they will leave their hotels, they will walk these streets, they will live their lives.
And we will all move forward together. Never giving in to terror. And never allowing the voices of hate and evil to drive us apart.