Sporadic violence broke out during a loyalist parade in Derry today.
Riot police moved in after a crowd of nationalists attacked the Apprentice Boys Parade in the centre of the city.
The trouble erupted as the parade was making its return journey. Police baton charged around 80 nationalists who hurled bricks and bottles.
A number of people were injured during the clashes and police made some arrests. They managed to push the crowd down Shipquay.
The security forces have moved into the area in large numbers to prevent further trouble.
Around 2,000 loyalists took part in the parade, which culminates in the burning of an effigy of Lundy, regarded as a traitor by loyalists during the Siege of Derry in 1689.
Police had erected large plastic screens at the Diamond in the centre of the city to divide nationalist protesters from marchers.
Despite discussions between the Apprentice Boys and the nationalist Bogside Residents Group, there had been fears of violence because the march coincided with the Old Firm derby between Rangers and Celtic.