The dissident republican group, the New IRA, was most likely responsible for the fatal shooting of a journalist during overnight rioting in the city of Londonderry, police in Northern Ireland said Friday. The Police Service of Northern Ireland said 29-year-old journalist and author Lyra McKee died after she was shot during rioting in the Creggan area. Assistant Chief Constable Mark Hamilton said a gunman fired a number of shots at police during the unrest Thursday evening. “We believe this to be a terrorist act,” he said.