Three police officers have been injured during disorder in Londonderry.
Fireworks and masonry were thrown at officers in the Nailors Row area of the city between 21:30 BST and midnight on Monday.
Two officers were struck by masonry, while a third was hit by a firework, the police said.
An 18-year-old man was arrested on suspicion of riotous behaviour and was later released on bail pending further enquiries.
Videos, which were widely circulated on social media, showed a number of youths gathering near the city’s walls.
A number of fireworks could be seen being directed towards officers close to a line of police vehicles.
