** FILE ** A Royal Ulster Constabulary police officer stands by the damage caused by a bomb explosion in Market Street, Omagh, Co Tyrone, Northern Ireland, 72 miles west of Belfast Saturday, August 15, 1998. Detectives arrested a suspected Irish Republican Army dissident Tuesday Nov. 22, 2005 on suspicion of involvement in the 1998 car-bombing that killed 29 people in Omagh, the deadliest terrorist attack in Northern Ireland's history. Police declined to identify the 34-year-old man arrested Tuesday. Nobody has been convicted in connection with the Aug. 15, 1998, explosion. (AP Photo/Paul McErlane)