The family of PC Keith Palmer, who was killed in the Westminster terror attack, have said to those who were with him in his final moments: "There was nothing more you could have done."
Several people, including a Tory MP and a boxing coach, tried to save the unarmed 48-year-old officer after he was stabbed by Khalid Masood in the grounds of the Palace of Westminster.
In a statement released last night, the family said: "We have been overwhelmed by the love and support for our family, and most especially, the outpouring of love and respect for our Keith.
"We want to thank everyone who has reached out to us over the past few days for their kindness and generosity."
They added: "The police have been a constant, unwavering support at this very difficult time. It has made us realise what a caring, strong and supportive family Keith was part of during his career with the police. We can't thank them enough.
"We would also like to express our gratitude to the people who were with Keith in his last moments and who were working that day. There was nothing more you could have done.
"You did your best and we are just grateful he was not alone. We care about him being remembered for his selfless bravery and loving nature. We miss him so much, but we are also incredibly proud of Keith."
Conservative MP Tobias Ellwood, 50, was among those who tried to help PC Palmer.
The Foreign Office minister was pictured with blood on his face and clothes as he tried to give PC Palmer mouth-to-mouth resuscitation and stem the blood amid the carnage.
Mr Ellwood, who has been appointed to the Privy Council after trying to save PC Palmer's life, has said he is "heartbroken" that his efforts were ultimately unsuccessful.
In a statement, he said: "I am heartbroken that I could not do more for PC Keith Palmer who gave his life in holding the line against terrorism and defending democracy. I shall be writing to the family of PC Palmer to offer my sincere condolences."
He added: "I played only a small part that day, doing what I was taught to do, and am honoured to have been invited to join the Privy Council afterwards."