Increased garda patrols and additional armed checkpoints and static security posts are now in operation in Dublin's north inner city following the murder of Michael Keogh.
The 37-year-old old was shot dead in an underground car park yesterday morning as he was on his way to work in construction.
Detectives believe he is the latest victim in the ongoing feud between the Hutch and Kinahan criminal gangs.
The cordon around the scene was lifted last night following the completion of the forensic examination.
Gardaí have renewed their appeal for witnesses and information.
They are anxious to speak to people who were in the Dorset Street or Clonliffe Avenue areas between 7am and 10am yesterday morning.
Detectives are particularly interested to hear from taxi drivers or motorists with dash cams or people with any recorded footage.
Gardaí fear there could be further violent attacks in retaliation for the murder.
A garda liaison officer has been appointed to assist the family.
A strong garda presence will be in place to ensure Mr Keogh's funeral passes off peacefully when it is held.
Sinn Féin's deputy leader Mary Lou McDonald this afternoon accused the Government of a "tokenistic and superficial" response to the situation in Dublin's north inner city.
During Leaders' Questions, she said the Government's response to date had been too slow and said people in the area were terrified.
Garda numbers had been cut and stations, including Fitzgibbon Street, had been closed, she added.
However, Tánaiste Frances Fitzgerald said there was no question of "standing idly by", saying enormous resources had been committed to the north inner city.
She said the armed response unit was in place and they had prevented planned killings.