Police investigating the murder of a pizza delivery man shot dead by dissident republicans said today they released a man being questioned over the killing.
A 33-year-old man was released by officers investigating the murder of Emmett Shiels, 22, in Derry, while a 17-year-old is still in custody.
Army technical officers also removed a car found in the Ballyarnett area of the city for further examination.
Members of the INLA have been blamed for the attack in the early hours of Tuesday which provoked outrage in Derry.
Mr Shiels, who police said was completely innocent, was shot in the stomach on the Creggan estate after an altercation with a gang of masked men who had been set to attack somebody else.
There has been widespread condemnation of the murder, with the young victim's partner pregnant with their first child.
Northern Ireland Chief Constable Hugh Orde has already warned of the threat from dissident republican groups opposed to the peace process.
“They are very much disrupted by police activity and indeed by security service activity. Over 30 have been arrested this year,” he said today.
“But I have also described it as the endgame. These are people who are, whilst disrupted and lashing out, are very dangerous on the back of that.”
He told the BBC: “We don’t underestimate the threat, but does that mean it’s going to unravel everything that has been achieved? Not in a million years.”
Five police officers have survived gun and bomb attacks launched by dissident republican groups in the North this year.