Pro-British loyalists in Northern Ireland said on Friday there had been a “spectacular collective failure” to understand their fears and anger over Brexit and other issues as police braced for more street clashes following a week of riots. New border arrangements with European Union member the Republic of Ireland must be negotiated, the Loyalist Communities Council (LCC) said in a statement. Despite appeals for calm from London, Dublin and Washington, the nightly unrest in pro-British areas spread further into Irish nationalist parts of Belfast on Thursday, where police responded to petrol bomb and stone attacks with water cannon. Nineteen officers and a police dog were injured, police said.