Two men have been arrested by police investigating the discovery of a mortar bomb in County Tyrone in September.
The device was found on a wall near houses in Church View, Strabane, on Saturday 7 September.
At the time, police said the New IRA intended to fire the device into Strabane police station.
Two 25-year-old men were arrested in Strabane on Tuesday morning. A number of searches were also carried out in the town.
It brings the number of arrests in the investigation to five.
Source: BBC News