Police in Northern Ireland say the dissident republican group the New IRA was probably responsible for the fatal shooting of a journalist during overnight rioting in the city of Londonderry.

The Police Service of Northern Ireland said Friday morning that 29-year-old investigative journalist 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.

Police guard a crime scene during unrest in the Creggan area of Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)
Police guard a crime scene during unrest in the Creggan area of Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)

“We believe this to be a terrorist act. We believe it has been carried out by violent dissident republicans,” he said.

There has been an increase in tensions in Northern Ireland in recent months with sporadic violence.

A car burns after petrol bombs were thrown at police in Creggan, Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)
A car burns after petrol bombs were thrown at police in Creggan, Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)
Armed police stage at the scene of unrest in Creggan, Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)
Armed police stage at the scene of unrest in Creggan, Londonderry, in Northern Ireland, Thursday, April 18, 2019. (Niall Carson/PA via AP)