Police investigating the murder of the Catholic PSNI officer Ronan Kerr have arrested a man, and have seized a 'significant' haul of arms in Co Tyrone.
The PSNI said the 26-year-old suspect was apprehended in Renton, Dunbartonshire, Scotland.
It is understood that he was detained yesterday and has since arrived in Northern Ireland.
He is being questioned by detectives at the Antrim Serious Crime Suite.
25-year-old PC Kerr was killed when a booby-trap bomb exploded under his car in Omagh, Co Tyrone, on Saturday.
Officers have also seized a major arms haul in Coalisland in east Tyrone described as the ‘most significant in recent years’.
The arms, including four Kalashnikov rifles, ammunition including six loaded magazines, timer parts, detonators, incendiary bombs and a quantity of explosives, possibly Semtex, were discovered last night.
The arms 'will now be forensically examined and provide new lines of inquiry for our investigators.'
A number of vehicles recently stolen in Co Tyrone were also found.
Asked whether the arrest and arms seizure were directly linked to the policeman's murder, Assistant Chief Constable Drew Harris responded: 'This is part of one line of inquiry within the Ronan Kerr murder investigation. I am not saying they are directly linked.'
Earlier, political leaders from both sides of the border attended the funeral of PC Kerr in the village of Beragh, Co Tyrone.
Taoiseach Enda Kenny was joined by Northern Ireland First Minister Peter Robinson and Deputy First Minister Martin McGuinness.
It is the first time for Mr Robinson to attend a Catholic requiem mass.
Michael Gallagher, whose son Aidan was killed in the Omagh bombing in 1998, along with local politicians from Unionists and Nationalists backgrounds are also in attendance.
Family members, PSNI colleagues and GAA officials and players helped carry the coffin from the Kerr family home to the Church of the Immaculate Conception.
GAA President Christy Cooney and Tyrone football manager Mickey Harte also helped to carry the coffin.
A guard of honour outside the church was made up of local school children, PSNI officers and members of Mr Kerr's former football club.
Garda Commissioner Martin Callinan arrived at the church with PSNI Chief Constable Matt Baggott.
Cardinal Seán Brady, the chief celebrant, said violence had absolutely nothing to offer except misery and destruction.
As the funeral took place, large crowds were expected to gather in Belfast city centre at a trade union-organised peace rally to protest at the killing.
After the mass, the cortege left the village.
The police, GAA and the Kerr family again carried the coffin as it made its final journey to the cemetery at the Church of St Patrick in the nearby rural setting of Drumduff.
Up to 7,000 people from across the community in Northern Ireland have attended a peace rally in central Belfast to show their opposition to the murder of Ronan Kerr.
The demonstration at belfast City Hall was organised by the Irish Congress of Trade Unions.
Mr Kenny told the Dáil yesterday that the Government would do its utmost to make sure gardaí had the resources it needed to co-operate with the PSNI in its investigation.
Mr Kerr was just weeks into his first posting as a PSNI constable. He was a Catholic and a member of the Beragh Red Knights club in his home parish.
He is survived by his mother, Nuala, a widow, as well as his sister and two brothers.
Independent charity Crimestoppers yesterday offered a £50,000 (€57,000) reward for information that will help detectives catch the constable's killers.
After announcing his decision to attend the funeral yesterday, Mr Robinson told a meeting of business leaders in Belfast that the murder served only to strengthen the resolution of politicians to make peace work.
'This was an utterly futile act designed to divide and destroy,' he said.
'The killers have succeeded in taking the life of a brave police officer but in doing so they have strengthened the resolve of the rest of our society in our commitment never to go back to the division and conflict of the last generation.'
