Police have been attacked with petrol bombs and other missiles during overnight trouble in Derry.
They were targeted during a disturbance in Moss Park in the Galliagh area at around 9pm on Friday.
A man aged 21 was arrested for disorderly behaviour.
Officers were also attacked during trouble in Northland Road at 1am on Saturday morning.
A 17-year-old youth was arrested for disorderly behaviour and later released.
At about 1.30am, police and fire crews extinguished a small rubbish fire near the sub station in Galliagh Park.
There were no injuries.