Two of the three suspects arrested by gardaí in connection with the discovery of a bomb under a police officer's car are from Dublin.
The three were arrested by heavily armed members of the regional support unit from the Garda's northern region after a car was stopped during a cross-border security operation.
The car had been fitted with false registration plates and efforts were being made last night to establish if it had been stolen.
The arrests were made at around 4am yesterday outside Ballybofey, Co Donegal, about an hour after the PSNI discovered a bomb fitted to a vehicle owned by one of their colleagues.
The car was outside the officer's home at Glenrandel in the village of Eglinton, on the outskirts of Derry city. Fifteen homes were evacuated.
PSNI local commander, Supt Mark McEwan, said the improvised device was capable of causing death or serious injury.
"This is another example of the cowardly elements in our society, who show no regard for the local residents or for the police officers, who serve their community", he said.
The three arrested, who are in their late 20s and late 30s, are all suspected of being members of the Real IRA.
They have all been released without charge this evening and a file will be prepared for the Director of Public Prosecutions.