The wife of murdered pensioner Graham Buck said breaking the news of his death to her daughter was "the worst act I have ever had to carry out in my entire life".
In a victim impact statement read out to the court, Karen Buck said: "To kill him was the most senseless, vicious act of violence.
"His family, friends and I will never be able to make sense of what happened. There was no justifiable reason and we will be left with that thought, and of his pain and suffering, for the rest of our lives."
More top news
Some children, particularly those who have been more directly affected, may show symptoms of stress and trauma.
A warmer day tomorrow
The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.