Police investigating the shooting of a police sergeant in Croydon on Friday have today arrested a man on suspicion of supplying a firearm.

A man was arrested in Norwich, Norfolk, in the early hours (around 2am) of Sunday, September 27, and has been taken to a south London police station.

Sgt Matt Ratana was fatally shot by a handcuffed suspect in the early hours of Friday at a custody suite in Croydon.

Police have today been 'painstakingly' searching four crime scenes as part of the investigation, with searches and forensics setting up site in the custody centre, Pollards Hill and two Surrey locations.

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The suspect for Matt’s shooting remains in hospital in a critical condition after he turned the gun on himself, and consequently police are not able to speak to him.

MORE: 'An inspiring & much-loved figure': Tributes pour in for murdered Croydon police sergeant

This comes as earlier today, a touching morning wreath-laying at the National Police Memorial in central London, and as East Grinstead Rugby Club remembered their head coach.

Speaking after the wreath-laying, Met Commissioner Dame Cressida Dick paid tribute to him as an "extraordinary person" who was "very good at his job".

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"If some good can come out of this terrible incident in which we have had one of our officers murdered, it would be that more people can understand a little bit about the challenges of police work and to see us police as who we are - human beings, going to work to help people, to support people and to protect people.

"Matt was the epitome of that."

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Leading tributes to fallen officers ahead of a virtual service for the 17th NPMD, the Prince of Wales said in a video message: "The dreadful incident in Croydon on Friday is the latest heartbreaking evidence of the risks faced by our officers daily."

Sgt Ratana, was originally from New Zealand and joined the Met in 1991. He leaves behind a partner and a grown-up son.

In East Grinstead, the club flag was flown alongside the New Zealand flag and an All Blacks rugby team flag to honour Sgt Ratana's roots.

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Tributes were laid outside the clubhouse and two periods of silence - for junior and senior club members - were held in memory of a man described by assistant head coach Ryan Morlen as an "irreplaceable figure".