The funeral will take place later of Ronan Kerr, the 25-year-old police officer who was killed in Omagh on Saturday.
First Minister Peter Robinson and Irish Prime Minister Enda Kenny will be among mourners at a Requiem Mass in the constable's home village of Beragh.Secretary of State Owen Paterson will represent the British government at the funeral.
Constable Kerr will be buried at the Church of St Patrick in Drumduff.
The 25-year-old Catholic police officer died when a bomb exploded under his car.
No group has claimed responsibility for the murder although dissident republicans are believed to have carried it out.
BBC Ireland correspondent Mark Simpson said in the past some Protestant politicians had been reluctant to attend Catholic funerals but Mr Robinson had made it clear that he felt it was important to demonstrate his support for the policeman's family.
Our correspondent said that since the policeman's killing, "there has been a huge outpouring of sympathy for his family, from both people on both sides of the Irish border".
'Overwhelming' messages
The Irish Congress of Trade Unions has organised a lunchtime rally in Belfast on Wednesday to allow people to express their abhorrence at the killing.
Books of condolence have been opened across Northern Ireland, while on its Facebook page the PSNI said it had been "overwhelmed by messages of sympathy and support".
On Tuesday, the Crimestoppers charity offered a £50,000 reward for information leading to those responsible for the murder.
Constable Kerr, who joined the police in May 2010, is the second officer to have been killed since the Royal Ulster Constabulary became the PSNI in 2001.
Constable Stephen Carroll was shot dead in a gun attack in Craigavon in March 2009.
Constable Kerr is survived by his mother, Nuala, two brothers, Cathair and Aaron and a sister, Dairine.
http://www.bbc.co.uk/news/uk-northern-ireland-12979656
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