It's the 25th anniversary of a peace deal in Ireland - a peace which looks increasingly tenuous.
On Tuesday petrol bombs were thrown at police during a march organised by a fringe dissident republican group in Derry, Northern Ireland.
This morning four pipe bombs were found in a Derry cemetery, hours before US President Joe Biden is expected to arrive in the country.
He says he is there to underscore the US commitment to preserving peace in Ireland.
Irish Examiner political correspondent Paul Hosford spoke to Corin Dann.
