Northern Ireland police say they have arrested a second suspected IRA dissident over the killing of a policeman and the discovery of a major weapons stockpile.
Police say the 40-year-old man was arrested Thursday as he drove between the County Tyrone towns of Omagh and Ballygawley.
He was taken to the main police interrogation center, where detectives already are questioning a 26-year-old man arrested Wednesday in Scotland.
Police say both men are suspected of involvement in Saturday's killing of Constable Ronan Kerr. The 25-year-old Catholic recruit died when a bomb hidden under his car exploded in the driveway of his Omagh home.
The weapons dump seized Tuesday included plastic explosive, detonators, parts for armor-piercing rockets, and four assault rifles.