Four addresses are being searched by detectives investigating the fatal shooting of a police officer in a custody suite in Croydon, south London.

Metropolitan Police sergeant Matiu Ratana, 54, was killed in the early hours of Friday when a handcuffed gunman opened fire before turning the weapon on himself.

Deputy Assistant Commissioner Stuart Cundy said the 23-year-old man, arrested on suspicion of murder, remained in critical condition in hospital.

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