The Prime Minister David Cameron has hailed the "extraordinary courage" of Essex police officer PC Ian Dibell, who lost his life while trying to stop a gunman in 2012.
Mr Cameron unveiled a memorial stone in honour of the 41-year-old, saying "it was a poignant reminder of what our police do to protect us."
Click below to hear from David Cameron
"I hope that as people visit this memorial over the generations, they will be inspired to stop for a moment to remember the extraordinary courage of one brave man who gave everything to protect the people he served in Clacton-on-Sea."
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