BELFAST, NORTHERN IRELAND - APRIL 08: Nationalists attack Police on Springfield Road just up from Peace Wall interface gates which divide the nationalist and loyalist communities on April 8, 2021 in Belfast, Northern Ireland. Trouble has flared for a second night running in the Springfield Road area of Belfast. US President Joe Biden joined UK prime minister Boris Johnson and the Irish prime minister Micheal Martin in a call for calm. Police are describing events as the worst scale of violence seen in Belfast for years. (Photo by Charles McQuillan/Getty Images)
Petrol bombs are hurled at police at Springfield Road, Belfast, near the peace wall interface that divides the nationalist and loyalist communities. Getty.

Irish PM warns of 'spiral', as unrest simmers in Northern Ireland

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