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Ms Sturgeon says Police Scotland have told her there is no increased terror risk in Scotland.

The first minister says the public should remain vigilant but go about their business as normal.

She says it is important to be clear that acts of terrorism are not due to any one faith.

Ms Sturgeon says: "Terrorists seek to undermine our values and destroy our way of life, they will not succeed."

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In a statement to the House of Commons, Prime Minister Theresa May said the attacker had tried to silence democracy, saying it was an attack on free people everywhere.

Paying tribute to PC Palmer, she said: "He was every inch a hero and his actions will never be forgotten."

She revealed that the attacker, who acted alone, was British-born and was known to police and the intelligence services.

Some years ago he had been investigated by MI5 in relation to concerns about violent extremism, but he was a "peripheral figure" and was not part of the current intelligence picture, she said.

Aysha Frade, 43 is the first member of the public to be identified as a victim.

The mother-of-two was reportedly crossing Westminster Bridge to collect her children from school when she was killed.

First Minister Nicola Sturgeon expresses her shock and sadness at the "heinous" attack on Westminster.

Ms Sturgeon says many MSPs have friends, colleagues and family members who work in the House of Commons.

She "says above all we stand in solidarity with London", which she says will never be cowed by terror attacks.

At today’s first minister's questions each of the party leaders will ask questions about yesterday’s terror attack at Westminster (effectively in lieu of a statement).

The other selected questions will be asked as normal but there will be no additional constituency questions from backbenchers. 

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Flags at the Scottish Parliament are flying at half mast as a mark of respect.

Holyrood held a minute's silence at 9.33am, the same time as Westminster held one.

The first minister has expressed her concern for those caught up in the terror attack, adding that "we all feel a sense of solidarity with the people of London". 

Public Health Minister Aileen Campbell says a decision on the outcome of the consultation will be made shortly after the results are reviewed.

Ms Campbell says the crucial thing is properly reviewing the consultation responses. 

The public health minister says the government is working to increase the level of donors along with this review. 

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More organs are being donated and more lives saved a year after Wales became the only nation in the UK to introduce a new donation law, say ministers.

Adults are regarded as having allowed organ donation unless they have opted out.

In the last year, there have been 160 organs transplanted and 39 were through deemed consent.

Wales' Health Secretary Vaughan Gething said numbers were encouraging and the change had been "good news".

In 2016, up to September, there were 42 deceased organ donors, broadly in line with previous years.

A woman who had a double-lung transplant last Christmas has written an emotional thank-you letter to her donor's family - as Wales marks the anniversary of a major new law.

The Scottish government said it would consider bringing forward new legislation on an "opt-out" system for organ donation despite MSPs rejecting a Labour member's bill on the topic last February.

MSPs voted by 59 to 56 to reject taking forward Anne McTaggart's  Transplantation Bill, external .

Holyrood's health committee  backed the aim, but not the detail of the bill.

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The government amendment accepted by MSPs said there were "merits" to such a system and pledged a consultation.

The amendment, lodged by then public health minister Maureen Watt voiced "serious concerns" about the "practical impact of the specific details" of the bill as it stood, and prevented it from proceeding to the next stage of consideration.

Labour MSP Mark Griffin, whose father died after a ten year wait for a heart transplant, reintroduced the Transplantation Bill last year.

• Look back at the Transplantation Bill debate on our Holyrood Live page

Labour MSP Mark Griffin asks the Scottish government what the timetable is for proceeding with the results of the consultation on increasing the number of organ donations. 

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Labour MSP Neil Bibby pays tribute to all police and PC Keith Palmer who died during yesterday's Westminster attacks.

Mr Bibby reiterates that there are those who believe this integration will reduce the effectivenes of policing on rail.

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Justice Secretary Michael Matheson says Police Scotland's plans to retain a specialist railway policing function will retain the skills and knowledge of those policing our railways. 

Mr Simpson asks if the government are going to listen to views against this merger.

Mr Matheson insists the government is listening to and consulting with stakeholders.

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The chief constable of British Transport Police has warned plans for a merger with Police Scotland could lead to a loss of specialist skills.

Paul Crowther told Holyrood's justice committee of a "real challenge" in replacing officers amid a "significant outflow of expertise".

He told MSPs of the bomb threats, fatalities and near-death incidents officers often have to deal with.

Police Scotland has called the merger plan  "complex but not insurmountable" .

Holyrood is currently  considering a bill  which would pave the way to absorbing the functions of the British Transport Police (BTP) into Police Scotland north of the border by April 2019.

Conservative MSP Graham Simpson asks the Scottish government what its response is to the comments by the divisional commander of British Transport Police in Scotland that its proposed merger with Police Scotland risks reducing the effectiveness of railway policing. 

Tory MSP Annie Wells says there have been reports that Yorkhill closures are down to staff shortage over Christmas and asks what will be done about this.

Ms Robison says staffing levels have increased over the past 10 years but so has demand and it is important services continue to meet the demands.

Health Secretary Shona Robison says the planning of local services is the responsibility of NHS boards.

Ms Robison says the board has confirmed that the closure is temporary. 

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Mr Sarwar says the minor injury unit closed two days before Christmas with no prior notice to locals apart from a sign at the door.

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The Labour MSP says he has a letter from the health board referring to funding challenges and saying there is no plans in place that will allow the unit to reopen currently.

Ms Robison says there will be a review into where the best location for a minor injuries unit that will best serve the people of the west of Glasgow.

Labour MSP Anas Sarwar  asks the Scottish government whether it plans to reopen the Yorkhill minor injuries unit and, if so, on what date it will do so.  

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Community Safety Minister Annabelle Ewing says the government is committed to tackling all forms of violence against women.

Mr Mason says he has heard a number of survivors of prostitution talking about their experiences.

He asks if the minister will agree to meet with survivors.

Ms Ewing says says it is important to speak to women with a range of views on criminalisation and she would be happy to meet with women who can share their views.

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Last December the UK government  supported an SNP MP's bill to ratify an international convention on violence against women .

The government signed up to the Istanbul Convention in June 2012 but is yet to formally ratify it.

Banff and Buchan MP Eilidh Whiteford put forward a member's bill on the subject, calling for a "united voice".

One Tory MP was accused of trying to "filibuster" the bill by talking for 78 minutes, but it progressed to the next stage by 135 votes to two.

SNP MSP John Mason asks the Scottish government what action it is taking to tackle violence against women in prostitution.