Police in Northern Ireland are blaming an Irish Republican Army splinter group for the death of a journalist who was covering riots Thursday night in Londonderry. Democratic House Speaker Nancy Pelosi was in the city the same day to celebrate the anniversary of the Good Friday Agreement, the 1998 peace deal the United States helped negotiate.

“We are treating this as a terrorist incident and we have launched a murder enquiry,” assistant chief constable Mark Hamilton said of the shooting of 29-year-old Lyra McKee. He urged witnesses to come forward with any information about the “horrendous and unjustified” death.

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