The Queen has sent a message to the Met's Acting Commissioner Craig Mackey:

"Following the shocking events in Westminster, Prince Philip and I are sorry that we will not be able to open the New Scotland Yard building as planned today, for very understandable reasons.  I look forward to visiting at a later date. 

"My thoughts, prayers, and deepest sympathy are with all those who have been affected by yesterday's awful violence.

"I know I speak for everyone in expressing my enduring thanks and admiration for the members of the Metropolitan Police Service and all who work so selflessly to help and protect others."

The Queen has said her "thoughts, prayers, and deepest sympathy" are with all those who have been affected by yesterday's "awful violence".

Indian sand artist Sudarshan Pattnaik has created a sand sculpture on Puri beach in India condemning the attack.

Image source, EPA

House of Commons
Parliament

A few more details from Theresa May's opening speech.

• The prime minister said that policing across the country will be stepped up "to protect communities across the country and to reassure the public"
• As a precautionary measure, this will include increased patrols and armed police in cities across the country
• She confirmed that the terror threat level remains set at "severe", meaning that an attack is "highly likely"
• However, she added that, in the absence of "specific intelligence that an attack is imminent", it will not be raised to "critical", which is the highest level. 

House of Lords
Parliament

The Archbishop of Canterbury offers "prayers and thoughts for PC Keith Palmer and his family".

He says a member of Lambeth Palace staff who is a Muslim was "narrowly" missed in the attack on Westminster Bridge and helped the injured for the rest of the day.

He describes this response as "typical of so many".

The Daily Telegraph

Terror came on Wednesday to the seat of government , external and Parliament for the first time since the IRA attacked Downing Street with mortar fire in 1991. Prior to that, in 1979 Airey Neave MP was murdered by a bomb planted in his vehicle which went off in the House of Commons car park. This time, people walking on Westminster Bridge were mown down by a car whose driver then proceeded to Parliament.

The Guardian

It was only ever a matter of time., external  This strike at Parliament took aim directly at the heart of British democracy. It was perhaps meant to reach the prime minister – for today, the day of prime minister’s questions, was the one day when her movements would be well known – but more probably it was, like the attack in Berlin just before Christmas, simply an attempt to hit at a European centre of power.

Image source, Getty Images

The Pope has offered his sympathy.

A letter to the Archbishop of Westminster, Cardinal Vincent Nichols, from the Vatican said: "Deeply saddened to learn of the loss of life and the injuries caused by the attack in central London. 

"His Holiness Pope Francis expresses his prayerful solidarity with all those affected by the tragedy. 

"Commending those who have died to the loving mercy of almighty God, His Holiness invokes divine strength and peace upon their grieving families, and he assures the nation of his prayers at this time."

A woman describes the "scary" moment police raided a Birmingham flat in an operation linked to the London attack.

Image source, PA

Labour leader Jeremy Corbyn said people must stand together in times of "darkness and adversity". 

What happened yesterday was an appalling atrocity, he tells MPs.

He asked: "Look after each other, help each other and think of each other. 

"It is by demonstrating our values - solidarity, community, humanity and love - that we will defeat the poison and division of hatred."

House of Commons Speaker John Bercow addresses MPs following the attack in Westminster, saying the police and security officers at Westminster had their "profound appreciation".

Image source, PA

In pictures: Day after London attack

Tobias Ellwood MP, who was pictured  immediately after the attack giving first aid to PC Keith Palmer, stood amongst his fellow MPs to hear the Prime Minister.

"We can confirm that the car used in the tragic attack in London yesterday afternoon was one of ours.

"An employee identified the vehicle after seeing the licence plate in an image online.

"We ran another check to verify, and immediately contacted the authorities.

"We are co-operating fully with the authorities and will provide any assistance that we can to the investigation.

"Our thoughts are very much with the victims of this terrible tragedy."