Police and fire crews were attacked overnight by a gang of youths in Derry city.
The emergency services were targeted with missiles as they responded to a car fire in the Frederick Street area at about 3am.
A police spokeswoman said two youths were arrested, and a third reported with a view to prosecution for public order offences.
Fire fighters had to withdraw from the area but police remained and managed to restore calm. One PSNI officer suffered a minor head injury.
Meanwhile, a disturbance was also reported in the Fountain Estate area of the city yesterday.
A group of youths threw missiles and a petrol bomb was also launched. There was no damage caused and no injuries were reported.
