A journalist was shot dead during riots in Northern Ireland in what police yesterday were treating as a terrorist incident following the latest upsurge in violence to shake the troubled region.

"Lyra McKee was murdered during orchestrated violence in Creggan last night," Assistant Chief Constable Mark Hamilton said in a statement.

McKee had earlier posted an image that appeared to be from the riots in the Creggan housing estate in the city of Londonderry, also known as Derry, accompanied by the words "Derry tonight. Absolute madness."