Mr Hutch was shot dead at a flat complex in the north inner-city
Gardaí have arrested a man in connection with the murder of Gareth Hutch in Dublin earlier.
The 29-year-old is being questioned at Mountjoy garda station, under section 50 of the Criminal Justice.
Earlier, gardaí said two men were involved in the fatal shooting on North Cumberland Street at around 10.00am.
Mr Hutch was shot several times at the Avondale House flats, near Mountjoy Square.
He was rushed to the Mater Hospital after initial treatment by emergency services at the scene.
The father of one is the seventh person to die as a result of the ongoing Hutch-Kinahan feud.
Residents of the north inner city protested last week over spiralling violence in the locality.
Superintendent Daniel Flavin says gardaí are trying to establish the movements of the getaway car used in the murder.
While Assistant Commissioner Jack Nolan says gardaí are extremely concerned about the level of violence in the capital.
Condemnation of the murder is coming from all sides.
Taoiseach Enda Kenny says he 'absolutely condemns' the shooting - saying the killers have 'no respect for life or limb'.
But the Taoiseach has denied there has been any scaling back of garda resources, and says the Garda Commissioner Noirin O'Sullivan has all the resources she needs to tackle the problem of gangland crime.
Mr Kenny says he does not think he can stop the "vicious and murderous dispute".
Mr Kenny also plans to visit Dublin's north inner-city and says the response by gardaí to the gangland has been extensive.
Locals say Mr Hutch knew his life was in danger. These people in the area have been giving their reaction.
Sinn Féin deputy leader and local TD Mary Lou McDonald has also condemned the latest shooting, calling for an end to the bloodshed.
She told Newstalk Lunchtime that residents are "very resolute in wishing to live in a peaceful and safe community".
Independent councillor Nial Ring, who grew up in the north inner-city, said the deceased was aware his life was in danger.
Mr Ring said he and the man discussed his application to move to a different flat in the complex yesterday.
Gardaí have appealed for anyone who was in the area to contact them at Mountjoy garda station on 01-666-8600, the Garda Confidential Line at 1800-666-111 or any garda station.