A 22 year old man has been arrested as part of the investigation into the murder of Constable Ronan Kerr in Northern Ireland last year.
The arrest was made in Milton Keynes by the North West Counter Terrorism Unit. The man, who's from Omagh, has been taken to a police station for questioning.
The Police Service of Northern Ireland says searches carried out earlier today in Cumbria and in Northern Ireland have been completed. Several items have been seized for examination. Police say their inquiries are continuing.
Officers investigating properties in the north of the county.
A statement from the Police Service of Northern Ireland said:
Police searches are being undertaken in Cumbria and Northern Ireland as part of the investigation into the murder of PC Ronan Kerr last April.