PORTADOWN, Northern Ireland (Reuters) -Rioters attacked police with petrol bombs, rocks and fireworks in the Northern Irish town of Portadown on Thursday, a Reuters witness said, as a fourth night of anti-immigrant violence moved to a different part of the British-run province.

Police have come under attack for a fifth consecutive night in Northern Ireland, in what has been dubbed a ‘week of shame’ for the region.

Spurred by false racist rumors, a fourth consecutive night of violence has plunged Northern Ireland into crisis, as anti-immigrant rioters once again attacked police, throwing bricks and masonry. The unrest, triggered by the arrest of two local teenage boys in connection with an alleged sexual assault earlier this week, continued on Thursday night.