Pc Ian Dibell, who was shot dead in Clacton, Essex, earlier today, was "an experienced and professional neighbourhood police officer" who "deliberately intervened in what he knew was an extremely deadly situation", Essex Police Chief Constable Jim Barker-McCardle said tonight.
Click here for the latest on this story.
More top news
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.