Image source, Getty

Ms Dugdale says London is microcosm of the word, open and multicultrual.

The Scottish Labour leader says it has a Muslim mayor and this attack cannot turn into a war against one community.

She says Britain remains a tolerant nation that is open to all faiths.

Ms Sturgeon agrees, saying that is an important message.

She says two weeks ago she walked over Westminster Bridge and it was packed with people of all nationalities and ages.

The first minister again says the responsibility for this attack does not lie with any faith or nationality.

She calls for vigilence against any hate crimes and says "the only people responsible for terror is the terrorists".

Prime Minister Theresa May has told MPs : "We will never waver in the face of terrorism."

Paying tribute to Pc Keith Palmer, who died after being stabbed, she said: "He was every inch a hero and his actions will never be forgotten."

Delivering a Commons statement she said Wednesday's attacker was British born and known to police and MI5. The attack was related to "Islamist ideology".

Labour leader Jeremy Corbyn described the attack as "an appalling atrocity".

Four people died, including the attacker, with 40 more injured.

The first minister says politicians are human as are the staff who work for them and it is moments like this that we are reminded of that humanity.

She says Police Scotland are taking steps, as far as it can be done, to guarantee public safety.

Ms Sturgeon again says there is no intelligence of an increased threat to Scotland, it is about assurance.

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Ms Sturgeon says the attack was a reminder that parliament is not just a symbol of our democracy, but also a place where people go to work.

Ms Sturgeon says she has many friends working at Westminster and her first thoughts when she heard of the attack ran to people she loves and her friends.

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Scottish Labour leader Kezia Dugdale adds the thoughts and prayers of her party to all those affected by the attack yesterday.

She also pays tribute to PC Keith Palmer.

Ms Dugdale says many people are going to work today concerned about the safety of others - police officers and nurses for example.

She asks what can be done to ensure public safety. 

Ms Sturgeon agrees, saying "we are united in those core values that we hold so dear".

The first minister says: "Terrorists will not divide us."

Ruth Davidson says this has been a week when we have been reminded that terrorism has many places.

Ms Davidson says the death of Martin McGuinness has reminded us of that situation and how terrorism comes in many guises. 

"We all stand united against terrorism and united in defeating it," she says. 

Ms Sturgeon says terrorists seek to divide, we must not do that.

No faith group, no section of society is responsible for yesterday's attack, says the first minister.

The brother of a British aid worker murdered by so-called Islamic State has made a plea for unity and calm in the wake of the Westminster terror attack.

David Haines, 44, who grew up in Perth, was beheaded in Syria in 2014 after being held prisoner for 18 months.

His elder brother Mike said it was "vital" that communities "remain calm and united", regardless of the motive.

Mr Haines works with groups to combat extremist indoctrination of young people in the UK.

The prime minister has said the attacker, who drove a car into pedestrians before stabbing a police officer, was British-born and known to MI5.

Ms Davidson says we can never guard against attacks like yesterday with higher walls.

The Scottish Conservative leader asks what the Scottish government can do to ensure the community engagement is there.

Ms Sturgeon details the police response and the counter terrorism measures.

The first minister says the best resilience comes from the public. 

She says the police have been in touch with faith groups.

The number of armed police officers patrolling Scotland's streets has been increased in the wake of the Westminster terror attack .

Police Scotland's deputy chief constable Johnny Gwynne said the force's armed presence had been increased substantially overnight.

He told BBC Radio Scotland that they were part of an increased overall police presence in major cities.

Officers were deployed to "keep the streets of Scotland safe", he said.

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Ms Davidson raises the issue of security in the light of yesterday's attack and thanks the police who "dropped everything" to go and help.

The first minister says the chief constable has told her that he has the resources he requires.

She says there is has been a substantial increase in the number of armed officers on duty in Scotland.

There is also an increase in unarmed police officers, says Ms Sturgeon.

She says the arrangements will remain in place for the forseeable future.

Ms Sturgeon says the police are doing everything they can to protect the public.

Image source, PA

Ms Sturgeon says disagreements are in the nature of democracy, but it is our ability to express these disagreements that is the hallmark of our democracy.

Ms Sturgeon says we have had the opportunity to remind ourselves that we are all united by our common humanity and it is democracy that defends this. 

First Minister Nicola Sturgeon says she agrees "wholeheartedly" with the words of Ruth Davidson.

Ms Sturgeon says "all of us feel the impact of what happened yesterday"

"Going back to work today must have been difficult and harrowing," but this gives us an example to follow, she says. 

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Scottish Conservative leader Ruth Davidson says her benches are in deep shock and send their condolences.

Ms Davidson pays tribute to the police and PC Keith Palmer.

She says the attack on our freedom will fail again today.

The Scottish Conservative leader says "we will not be silenced and we will not be cowed".

Ms Sturgeon says a police officer went to work yesterday and did not return home, and that 

her thoughts are with the family of PC Keith Palmer. 

The first minister thanks those who keep us safe and says she has been consulting with stakeholders around security measures in Scotland.