Its not a lone incident its a small splinter group of republicans who never accepted the peace process. They're the same group who carried out the Omagh bomb which killed 31 people a few years ago, and they also planted a car bomb outside the BBC offices in Belfast about a week ago, fortunately it was found and defused before it went off.
Another splinter group called the Continuity IRA killed a policeman a few days ago....
Dissident republicans, the Continuity IRA, have said they murdered a policeman in Northern Ireland.
He was Constable Stephen Paul Carroll, 48, a married man with children from the Banbridge area of County Down.
He died just 48 hours after two soldiers were shot dead by the Real IRA at an army base in Antrim.
Monday night's shooting happened at Lismore Manor, in Craigavon, County Armagh, after a woman called police when her window was broken.
Constable Carroll was shot through the rear window of his police car when he arrived at the scene at about 2145 GMT on Monday.
Police say they are looking for a man in a light coloured top who was seen running from the area after the shooting.
At least two houses have been searched in the nearby Drumbeg estate.
At a press conference on Tuesday afternoon, Chief Superintendent Alan Todd said the constable had given 23 years of service to the community, working with the police service.
"We have this morning, colleagues without a workmate, a wife without a husband, a son without a father and grandchildren without their grandfather," he said.
"It is a desperate loss ... we are working with people to provide safer communities, my question to the people who perpetrated this is 'What have they got to offer?'"
The Continuity IRA is one of a number of dissident republican paramilitary groups opposed to the peace process which have carried out bomb and gun attacks on civilians and the security forces.
There is believed to be cross-over and co-operation between the Continuity IRA and the larger Real IRA, which bombed Omagh in 1998 killing 29 people and injuring hundreds more.
Chief Constable Sir Hugh Orde called it a "sad day" for Northern Ireland's force and said the gunmen were "criminal psychopaths", but said he would not ask for the Army to help patrol NI's streets.
"I have no intention to ask the Army for routine military support, it's not necessary and it doesn't work," he said.
McGuinness: 'These people are traitors to the island of Ireland'
Sir Hugh held a joint press conference with the first and deputy first ministers Peter Robinson and Martin McGuinness at Stormont.
Mr Robinson said: "This is a battle of wills between the political class and the evil gunmen - the political class will win."
Mr McGuinness said the dissidents' actions were futile: "These people are traitors to the island of Ireland, they have betrayed the political desires, hopes and aspirations of all of the people who live on this island."
Prime Minister Gordon Brown has condemned the murderers and insisted there would be "no return to the old days" in Northern Ireland.
This is the first murder of a police officer in NI since 1998. Constable Frank O'Reilly was killed by a loyalist blast bomb during disturbances linked to the Drumcree dispute in 1998.
The last police officers murdered by republicans, RUC constables Roland John Graham and David Andrew Johnston, were shot dead by the IRA in Lurgan, County Armagh in June 1997.
Constable Carroll was the first PSNI officer to have been murdered by paramilitaries since the force was formed in 2001.
Dissident republicans tried to kill two PSNI officers in shootings in Derry and Dungannon in November 2007.
http://news.bbc.co.uk/2/hi/uk_news/northern_ireland/7934426.stm
Topic: Two Soldiers killed in Northern Ireland