An IRA bomb exploded under a car Monday, killing a protestant accoountant as he waited at a traffic light, police said.

In a statement to local news media, the Irish Republican Army said it killed Robert Orr because he was a member of a British army unit and had been involved in recent house searches in Armaugh.A spokesman for the Royal Ulster Constabulary said Orr had no connection with the security forces since resigning from the police reserve 16 years ago.