Police claimed four suspected pipe bombs were seized from a cemetery in Northern Ireland during an Easter procession earlier this week.
The suspicious devices were discovered in Londonderry, approximately 110 kilometres northwest of Belfast, where police were attacked with petrol bombs and other items during a protest against the Belfast (Good Friday) deal on Monday, according to Xinhua news agency, quoting police on Tuesday.
This week celebrates the 25th anniversary of the Good Friday Agreement, which ended the Troubles in Northern Ireland after 30 years of violence.
On Tuesday, US Vice President Joseph Biden visited in Belfast to commemorate the occasion.
Terrorists may be aiming to drag police into public disturbance in Londonderry as an excuse to undertake attacks, according to community information, Assistant Chief Constable Bobby Singleton said in a separate statement.
