Northern Ireland police say they have arrested a third man over the killing of a policeman by suspected Irish Republican Army dissidents.
Police say a 33-year-old man was arrested Friday in the town of Omagh, where Constable Ronan Kerr was killed last week by a bomb hidden under his car.
Police also are questioning a 40-year-old man arrested in Northern Ireland and a 26-year-old man detained in Scotland.
All three are suspected of involvement in Saturday's killing of Kerr, a 25-year-old Roman Catholic recruit to the police force.
Police investigating the murder also have uncovered a major weapons dump, including plastic explosive, detonators, parts for armor-piercing rockets and assault rifles.