A phone registered to a builder accused of involvement in the Omagh bomb can be traced to within 5km of the town an hour before the explosion, the High Court has heard.
The claim was made at the civil retrial of two men being sued over the bombing.
Colm Murphy and Seamus Daly are defending the action taken by some of the relatives of the victims.
A retrial was ordered after their appeals against being held liable for the bombing were upheld last year.
An investigating detective said Mr Murphy's mobile could be connected to the area by analysis of mast coverage but also confirmed the County Louth man is not suspected of being in Omagh on the day of the Real IRA attack in August 1998.
Mr Murphy, a Dundalk-based contractor and publican, is being sued along with former employee Seamus Daly, from County Monaghan, over the atrocity that killed 29 people and injured hundreds more.
Both men deny the claim against them.