There are fears of a further outbreak of gangland violence in Dublin following yesterday's murder of a prominent dissident republican in the city.
The victim has been named as 25-year-old Vincent Ryan, the brother of Real IRA figure Alan Ryan, who was murdered in 2012.
He lost his fight for life in the Mater Hospital last night, after being shot a number of times on McKee Road in Finglas.
Superintendent John Quirke says Gardaí are hopeful witnesses will come forward.
Supt Quirke said: "There may have been a number of witnesses in the area at the time, McKee Road is quite a busy area, very residential, a well-established area.
"So we anticipate that there may have been people in the area at the time of the shooting.
"We have no evidence at the moment to indicate that it was connected to any of the shootings that happened in the last couple of weeks in Dublin city."
Gardaí are seeking information about a silver or grey Volkswagen Golf with alloy wheels believed to have been used by the gunman in the latest killing on the capital's streets.
It was seen speeding away from the murder scene towards nearby Clune Road and Jamestown Road.
A car has since been found burnt out in the Victoria Bridge area on the Naas to Rathangan Road which investigators believe may be involved in the shooting.
A number of scenes have been sealed off for technical examination by Garda forensic experts.