A man has been arrested in connection with the investigation into the murder of a Metropolitan Police sergeant, as tributes were paid to the "extraordinary" officer.
Sergeant Matt Ratana was shot by a handcuffed suspect in the early hours of Friday at a custody suite in Croydon.
A man was arrested in the early hours of Sunday in Norwich, Norfolk, on suspicion of supplying a firearm.
The suspect for the shooting remains in a critical condition in hospital and police said they have not yet been able to speak to him.
It comes as Sgt Ratana, 54, was remembered by friends and teammates at East Grinstead Rugby Club where he was head coach.
Also on Sunday Met Commissioner Dame Cressida Dick paid tribute to him as an "extraordinary person" who was "very good at his job".
