A Nottinghamshire police officer who was killed after being dragged by a stolen car in Bulwell was among those being remembered on Sunday.
Dog handler PC Ged Walker was killed in 2003, after he was dragged by a stolen car through the streets of Bulwell as he attempted to remove the keys.
National Police Memorial Day is held to pay respects to officers who lost their lives while on duty.
Prince Charles and Home Secretary Theresa May attended a memorial in Belfast.
The prince told the annual remembrance event, which is held in a different venue each year: “We are drawn together from across the UK to demonstrate our deep respect for these brave men and women. They will never be forgotten and through us, their exceptional legacy will always be remembered.
“We owe them an immense debt of gratitude.”