By , , and , CNNLink Copied!Ad Feedback — The White House joined Northern Irish, British and Irish leaders on Thursday, expressing concern as parts of Northern Ireland experienced a week of violence as unionists and nationalists clashed with police and each other.amid rising and unionist anger over a decision by police not to prosecute leaders of the Irish nationalist party Sinn Fein for allegedly breaking restrictions during the funeral of a former leading IRA figure.In west Belfast on Wednesday, rioters along the so-called “peace line” dividing predominantly unionist and...…By , , and , CNNLink Copied!Ad Feedback — The White House joined Northern Irish, British and Irish leaders on Thursday, expressing concern as parts of Northern Ireland experienced a week of violence as unionists and nationalists clashed with police and each other.amid rising and unionist anger over a decision by police not to prosecute leaders of the Irish nationalist party Sinn Fein for allegedly breaking restrictions during the funeral of a former leading IRA figure.In west Belfast on Wednesday, rioters along the so-called “peace line” dividing predominantly unionist and...WW…