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Londoners will gather for a candlelit vigil in Trafalgar Square this evening in memory of the victims of the Westminster terror attack.

Sadiq Khan invited residents - as well as visitors - to attend the event at 6pm to show the world that London remains united.

He said: “London is the greatest city in the world. We will never be cowed by terrorism. 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.”

The Mayor believes the vigil will give people the opportunity to remember those who have lost their lives, show solidarity for those injured, and express sympathy to their families and loved ones.

He added that the event would show the world that Londoners were “more committed than ever” to the capital’s values of openness and freedom.

The Mayor has invited all Government ministers, MPs and peers, borough leaders, faith leaders and military chiefs to the vigil.

This morning a book of condolence was laid in Westminster Hall for MPs, staff and the public to write messages to honour those who died in yesterday’s attack.

People on social media have also shown their support by sharing a graphic using the iconic Underground emblem, emblazoned with the slogan “We are not afraid”.

The image is being accompanied by the hashtags #WeAreNotAfraid, #LondonAttacks and #Westminster.

The House of Commons’ deputy speaker Lindsay Hoyle said support was in place for all staff in Westminster affected by the attack.

He said: “It is another alarm, it is another one we have to take seriously, but the one thing I can be sure of - terrorism will not defeat democracy.”

“It’s a horrible day for members, but we’ve got to get on and show terrorism will not defeat the House of Commons.”