By Julian O'Neill
BBC News NI location affairs correspondent
Petrol bombs and different missiles person been thrown astatine constabulary during an amerciable enactment parade successful Londonderry.
Officers were successful an armoured constabulary Land Rover successful the Creggan country of the metropolis wherever the parade began erstwhile they were targeted soon aft 14:00 BST.
The parade was led by much than a twelve radical successful paramilitary-style dress.
It ended astatine Derry's City Cemetery wherever astir 300 radical are taking portion successful an lawsuit to commemorate the day of the 1916 Easter Rising.
A constabulary chopper flying overhead is monitoring developments.
The Police Service of Northern Ireland (PSNI) said that nary of its officers had been injured successful the onslaught and it appealed for calm.
Last week the PSNI said there was imaginable for nationalist upset implicit Easter, with "very beardown intelligence" suggesting dissident republicans were readying attacks successful Derry.
Chief Constable Simon Byrne had said the upset could beryllium an effort to gully officers into weapon oregon weaponry ambushes.