Raw : Twenty-six people are being questioned by police following trouble in Londonderry on Saturday night.
Two police officers were injured after petrol bombs and other missiles were thrown following an earlier Apprentice Boys' parade through the city.
The trouble flared at Butchers Gate, Magazine street, Fahan Street and Memorial Hall.
A substantial quantity of alcohol was seized during the day.
The police said the parade itself passed off "largely peacefully".
Its start was delayed following the discovery of two suspicious objects at Governor Walker's Pillar on the city's walls.
Controlled explosions were carried out by the Army. The devices were later declared elaborate hoaxes.
Up to 10,000 Apprentice Boys and 130 bands took part in the parade
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