He said: “Her Majesty the Queen served this country with dedication and devotion for more than 70 years and she will be greatly missed by the British public.
“We knew her, first and foremost, as a servant of the people. But she was also a mother, grandmother and great-grand mother and a friend.
“Today my thoughts are with the Her Majesty’s family and loved ones at this very sad time.
“I will be writing to send my condolences to the royal household and flags across the Gwent Police estate will be flown at half mast as a mark of respect.”