The drive-by shooting of a 16-year-old boy depicts the callousness and barbarism of Dublin's criminal fraternity, Justice Minister Alan Shatter has said.
Gardai are pursuing several important lines of inquiry, Mr Shatter said, after the teenager was shot in the back and arm as he stood outside a house in the Crumlin area of Dublin on Tuesday night.
A man in his late 20s was arrested on Wednesday afternoon and is being questioned at Crumlin Garda Station, where he can be held for up to 72 hours.
Gardai later arrested a second man in connection with the shooting. He is described as aged in his late 20s and is being held at Sundrive Road garda station.
Local councillors said the community is horrified by the indiscriminate attack on the youth, who was not known to gardai.
"This is yet another example of the callousness and barbarism of some of those engaged in criminality in Dublin. Hopefully this young man will recover from this event," Mr Shatter said.
"We are going to continue to target those who engage in this type of behaviour which is completely and totally unacceptable."
Detectives are trying to establish a motive for the gun attack, which happened at around 9pm in Lismore Road, or if the youth was an innocent bystander. He was rushed to St James's Hospital where he is in a serious but stable condition. His injuries are not thought to be life-threatening.
Deputy Garda Commissioner Noirin O'Sullivan said the shooting is a terrible atrocity and reprehensible, but stressed there is nothing to suggest that it is an escalation in the bloody Crumlin/Drimnagh feud which has claimed 15 lives in a decade.
The boy, who is the second youngster to be shot in Dublin this year, was with two people when a black saloon car pulled up and two shots were fired. It is not yet known if a man in the teenager's company was the intended target but Fine Gael councillor Ruairi McGinley said it is clear that the gunman meant murder.