Met Police launch murder investigation after a police officer was shot dead at a South London custody centre.
The Metropolitan Police say a 23-year-old man was detained at the scene at Croydon Custody Centre.
The officer was shot at 2.15am on Friday by a man who had already been arrested.
Commissioner Cressida Dick said: “This is a truly shocking incident in which one of our colleagues has lost his life in the most tragic circumstances. My heart goes out to his family, direct colleagues and friends.”