Friends, colleagues, and members of the public have shared their grief online following the news that Labour MP Jo Cox died on Thursday after being shot.
Cox was attacked in Birstall, West Yorkshire, on her way to a constituency surgery just before 1pm, before dying of her injuries less than an hour later. A 52-year-old man has been arrested in connection with the incident.
Police confirmed that she had died as a result of her injuries. A 77-year-old man was also injured, though police said his injuries were not threatening.
Cox, a mother of two, had been the Labour MP for Batley and Spen for just over a year, after being elected in May 2015.
Before the news of her death was made public her husband, Brendan, tweeted a picture of his wife as people wished him "courage and strength".
Cox lived with Brendan, a former adviser to Gordon Brown, and their two young children in a converted barge moored at Tower Bridge on the Thames.
She grew up in the constituency she represented, in a town called Heckmondwike. She was said to be a passionate and committed advocate for human rights.
After graduating from Cambridge University in 1995, Cox worked in war zones across the world as head of policy for Oxfam. She was also a senior adviser for anti-slavery charity Freedom Fund and chaired the Labour Women's Network.
Labour leader Jeremy Corbyn MP led tributes from the party and said Cox was "universally liked" in Westminster.
"Jo had a lifelong record of public service and a deep commitment to humanity," he said in a statement.
"Jo was dedicated to getting us to live up to our promises to support the developing world and strengthen human rights – and she brought those values and principles with her when she became an MP.
"Jo died doing her public duty at the heart of our democracy, listening to and representing the people she was elected to serve. It is a profoundly important cause for us all. Jo was universally liked at Westminster, not just by her Labour colleagues, but across parliament.
"In the coming days, there will be questions to answer about how and why she died. But for now all our thoughts are with Jo's husband Brendan and their two young children.
"They will grow up without their mum, but can be immensely proud of what she did, what she achieved and what she stood for.
"We send them our deepest condolences. We have lost a much loved colleague, a real talent and a dedicated campaigner for social justice and peace. But they have lost a wife and a mother, and our hearts go out to them."
Prime minister David Cameron called Cox's death "absolutely tragic" and said British politics had lost a "great star".
The death of Jo Cox is a tragedy. She was a committed and caring MP. My thoughts are with her husband Brendan and her two young children.
In a statement, he said: "This is absolutely tragic and dreadful news and my thoughts are with Jo’s husband Brendan, their two children and wider family. We’ve lost a great star. She had a big heart and people are going to be very, very sad at what has happened.
“She was a very strong campaigning MP. She had a great track record of caring about refugees and had taken a big interest in how we can look after Syrian refugees and do the right thing in our world. She was a star for her constituents, a star in Parliament and a star right across the House."
Cameron added it was right to suspend European referendum campaigning activity.
Labour MP Yvette Cooper praised Cox as brave, lively, and passionate, and Jess Phillips MP called her an "amazing brave giant".
One of liveliest, bravest & most passionate MPs. Thoughtful, creative, determined. Cannot believe we have lost you @Jo_Cox1
My heart is broken. She was amazing a brave giant who stood against bullies.
I am so terribly sorry that Jo Cox has died. Assassinated by a mindless thug serving her constituents, it's so awful. Those poor children
Friends and colleagues praised her, extending their deepest sympathies to her family.
Am so sad to hear the news about Jo Cox. Absolutely terrible. My thoughts are with her family.
Jo Cox was the most lovely person, heartfelt sympathy to her husband her children & the community she devoted herself to
My deepest, deepest sympathies to the friends, family and constituents and colleagues of Jo Cox MP. No words
Pauline & I are devastated to hear of Jo Cox's murder. A brilliant campaigner & local MP. Such a terrible loss to her family and to us all.
Appalling news. My thoughts with Jo Cox's husband and children. Please let us stay calm and wait for the police to establish what happened.
The archbishop of Canterbury said he was "deeply shocked", while Cambridge University and Oxfam said they were devastated and saddened to hear of her death.
All @oxfamgb are devastated at the loss of our much loved and admired former @Oxfam colleague Jo Cox MP. Deep condolences to Jo's family
We are deeply saddened by the tragic news of Jo Cox's death. Our thoughts go out to her family and friends at this difficult time.
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.
Batley and Spen's Labour youth officer, Jawad Khan, said Cox had helped him "to believe in myself".
RIP Jo â¤ï¸ You helped me to believe in myself. Now I'm going to make you proud. Our community has lost one of the kindest souls I've known
Scottish Labour leader Kezia Dugdale said Cox was an "extraordinary" woman.
She said: "There will be time to talk about what the savage murder of an elected representative means for our democracy but that's for another day. Today we mourn the loss of one of our own.
"Jo was an extraordinary woman. She devoted her life to helping people in the darkest places in our world. Our hearts are broken by the loss of one of our country's brightest hopes. We mourn not just the woman she was but the loss of everything she would have achieved."
Fellow MPs and politicians, including the president of the European Commission, expressed shock and sadness at the shooting earlier today and extended prayers to Cox's husband and two children before news of her death was confirmed.
Deeply shocked by news of terrible attack against MP Jo Cox. Thoughts and prayers with her husband and children.
Shocked to hear terrible news about brilliant MP and friend Jo Cox. Thinking of her and praying for her and family.
Just heard the absolutely horrific news about the attack on Jo Cox MP. My thoughts are with Jo and her family
Hoping, praying and thinking of Jo, Brendan and the children. GB
Former Liberal Democrat leader Nick Clegg was at a pro-EU rally in Edinburgh with other political figures as reports of the shooting filtered out.
Nick Clegg: "Jo Cox is a very old friend of mine and a lovely, lovely woman. I just hope we don't have to hear the worst."
Scottish Lab leader Kezia Dugdale says the news about Jo Cox "cuts at the heart" of what MPs and MSPs do and sends her best wishes to her.
Andrea Jenkyns, the MP for Morley and Outwood, released a statement saying she was praying for Cox.
She said: "I am very upset by this appalling incident involving my constituency neighbour and colleague Jo Cox. We are all praying for her and thoughts and prayers go out to her family at this incredibly difficult time.
"Jo is a hugely committed campaigner and advocate for Batley and Spen and the causes she supports. No MP should be at risk of attack. MPs put themselves in the public eye to stand up for their constituents and their beliefs and should not be put at risk from doing so. British politics is better than this."
The prime minister of Australia also offered his condolences.
Deeply shocked by the murder of UK MP Jo Cox. Our condolences, prayers and solidarity are with her family & the people of the UK.