Signs on the gates of the church said no photography or audio or video recordings would be permitted within the church grounds.Francis Street itself was closed to traffic while the funeral was underway, while a number of business premises on the street remained closed.

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Murder squad detectives believe his murder was retaliation for the shooting dead of Gary Hutch on the Costa del Sol last September.

Byrne's killing was avenged three days later with the murder in his Dublin home of Eddie Hutch, 55, brother of suspected armed robber Gerry Hutch, known as the Monk.

This afternoon scores of people lined the narrow grounds and the street outside as the American-style casket holding Byrne's body was shouldered past the crowd this afternoon.

It is understood that the predominant blue colouring was a reference to a sporting team supported by Mr Byrne.

A lone piper played a lament while a large floral tribute with a picture of Mr Byrne at its centre was also carried in.

Byrne, a father of two, lived in Crumlin and was said to have been associated with an international drugs gang operating out of the south of Spain.

There was a significant garda presence at the funeral, with officers keeping press photographers and videographers about 150 metres from the church gates which are locked.

Inside, Fr Niall Coghlan spoke about Mr Byrne's brutal death, saying for a person to carry out such an act in cold blood they would have to be dehumanised.

He also questioned whether the killers would have shot Mr Byrne if they saw a film of his life - which would have portrayed him as both a loving partner and father.

The funeral Mass ended shortly after 2pm, and the funeral cortege then started to make its way to Mount Jerome Cemetary.

Eight young men in dark blue suits, blue shirts and dark blue ties had earlier carried the coffin into the church.