Michael Foster, chairman of trustees for COPS (Care Of Police Survivors) said the memorial was a way for people who have lost family in the police force "to come together and reflect and remember their loved ones who are no longer with us".
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Specially-trained prison security teams were sent to HMP Hewell near Redditch, after trouble broke out on one of the prison's wings.
Scattered showers will develop through the late morning with some heavy, perhaps thundery downpours.
It will be a largely dry start to Sunday with some sunshine but showers to develop.