MPs reacted with horror after Labour MP Jo Cox was shot and injured in an attack near Leeds.
The 41-year-old mother of two was left lying bleeding on the pavement after the incident in Birstall, West Yorkshire.
Prime Minister David Cameron said: "Very concerned about reports Jo Cox has been injured. Our thoughts and prayers are with Jo and her family."
Neighbouring MP Yvette Cooper said: "Terrible, terrible news. Thoughts and prayers with good friend Jo and with her family."
Labour's Chuka Umunna said: "Utterly awful news about an attack on a superb and wonderful colleague @Jo_Cox1 - hoping and praying for her and her family right now."
Conservative MP Sir Eric Pickles said he was "very shocked" and he is praying for her recovery.
Tory Steve Baker said: "Utterly appalling news - Godspeed for a quick recovery."
Labour's Lucy Powell said: "Dreadful, dreadful news coming in about my good friend Jo Cox. I really hope all ok. Awful."
Conservative Stewart Jackson said: "I do hope that MP @Jo_Cox1 is ok after incident in her constituency. Shocking news."
Tory Stuart Andrew said: "Horrified to hear the reports about Jo Cox. She's a lovely colleague and someone I respect enormously. My prayers and thoughts for all."
Vote Leave has suspended battle bus campaigning for the day in light of the attack on Ms Cox.
Boris Johnson, who was out campaigning on the bus in East Anglia, said: "Just heard the absolutely horrific news about the attack on Jo Cox MP. My thoughts are with Jo and her family."
Liberal Democrat leader Tim Farron tweeted: "Utterly, utterly horrific to see reports about @Jo_Cox1. My thoughts and prayers are with her, her family & staff".
SNP MP and Westminster group leader Angus Robertson tweeted: "Appalling news about attack on Labour MP @Jo_Cox1. Best wishes to her and friends from colleagues in @theSNP".
Labour's John Mann said Ms Cox is an "absolutely outstanding" MP and he was "totally shaken" by the attack.
He told the BBC: "She is one of the real stars of the new intake, not just on the Labour side but on all sides.
"She is hard working, eloquent, everyone likes her, she's one of the real stars of the future."
Nigel Dodds, deputy leader of the Democratic Unionist Party, said: "Terrible news about Jo Cox MP. Praying she will make a full recovery."
Shadow home secretary Andy Burnham said: "What is happening to the world? Love & prayers to @Jo_Cox1 & all her family."
Armed Forces Minister Penny Mordaunt said: "Thoughts and prayers are with Jo Cox and her family. Horrific attack on a wonderful woman."
Mr Johnson told reporters: "A colleague of ours, Jo Cox, has been attacked and very seriously injured today.
"We have decided in view of that to suspend all campaigning. The visit will not be going ahead.
"(Penny Mordaunt) and I will be going back to London to find out more.
"Our thoughts are very much with Jo Cox and her family."
He said he hopes the culprit is "brought to justice as soon as possible".
Ms Mordaunt added: "I know Jo fairly well because of the work she did on Syria and heading up the all-party group on that."
She also said: "She is highly respected as a former aid worker and there will be enormous concern on all sides of the House for her wellbeing and all our thoughts and prayers are with her family at the moment."
Shadow Commons leader Chris Bryant said he feels "rage and sadness" at the shooting of his colleague Ms Cox.
He added: "Honestly @Jo_Cox1 is the most passionate fighter for justice at home and abroad I know. I hope and pray she's ok".
Labour former prime minister Gordon Brown said: "Hoping, praying and thinking of Jo, Brendan and the children."
Scotland's First Minister Nicola Sturgeon said: "This is dreadful news. My thoughts and those of @theSNP are with Jo Cox and her family."
Ukip leader Nigel Farage said: "Horrified to hear of the attack on Jo Cox. Wishing her well."
Business Secretary Sajid Javid said: "Absolutely shocked & appalled by attack on Jo Cox. Thoughts & prayers with Jo, her family and friends."
Scottish Justice Secretary Michael Matheson offered his thoughts and prayers to Ms Cox and her family, during a statement in Holyrood in which he confirmed armed police in Scotland will be increased by a third.
He said: "Like all members in this chamber I'm sure, my thoughts and prayers are with her and her family at what I am sure is an extremely difficult time for them."
Scottish Labour deputy leader Alex Rowley expressed his horror at the shooting, which happened just minutes after Police Scotland announced the armed response escalation at a briefing in Edinburgh.
Speaking in Holyrood, he said: "I'm sure the thoughts and prayers of everyone in this chamber are with Jo and anyone else who have been injured."
Labour MSP Mary Fee said: "The breaking lunchtime news of my colleague Jo Cox casts a dark shadow over today's statement and highlights the need for safety and security in all of our communities."
Archbishop of Canterbury Justin Welby said: "Deeply shocked to hear about the attack on Jo Cox. Heartfelt thoughts and prayers of all here are with Jo and her family and friends."
The National Autistic Society said: "Shocked to hear the awful news about Jo Cox MP, a fantastic autism champion. Our thoughts are with her & her family."
Scottish Labour leader Kezia Dugdale said: "What is clear is that Jo Cox was attacked doing what politicians do most days when they are out-with Parliament - holding a constituency surgery.
"To be attacked like that is deeply alarming and very concerning.
"Jo is a very active, good MP, everybody will be very concerned about her health.
"We are collectively hoping and praying she is going to pull through."
Former deputy prime minister Nick Clegg, a long-time friend of the MP, said his thoughts are with her and her family, friends and colleagues.
He said: "I am deeply shocked as someone who knows Jo. She is a lovely decent person, full of goodwill to everybody.
"My heart goes out to her and everybody affected.
"But also it is such a vile affront to our democracy.
"One of the great things about our democracy is that anybody can just wander in and see their MP in their weekly surgeries.
"That violence against Jo, although that is the most important thing... is also violence against our democratic values and very proud democratic traditions."
Ireland's Foreign Affairs Minister Charlie Flanagan said he was horrified at the attack on "democratic politics".
"The fact that Ms Cox was attacked in this vicious way in the course of carrying out her duties for her constituents is deeply shocking," he said.
"The suspension of the Remain and Leave campaigns for today is an apt recognition that today's horrific incident was an attack, not just on Ms Cox personally, but on the practice of democratic politics."
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