Police have been attacked with petrol bombs and missiles as they carried out searches targeting dissident republicans in Londonderry.
Officers were targeted after finding a suspicious object while carrying out searches for New IRA bomb-making equipment in the Creggan Heights area of the city.
The Police Service of Northern Ireland later confirmed the object was a "viable explosive device".
Having evacuated some 15 homes late on Monday night, they tweeted soon after 5am on Sunday that the device had been made safe and residents could return to their dwellings.
Young people engaged in the disorder in Derry's Creggan estate sustained burn injuries during the violence on Monday night, the police said.
The police searches were launched after a dissident republican mortar bomb was recovered in Strabane, County Tyrone on Saturday.
The mortar, which was positioned close to a family home, was aimed at the town's police station.
It was the seventh attempted murder bid against the security forces in Northern Ireland this year.
Journalist Lyra McKee, 29, was murdered by the New IRA in the same Creggan Heights area in April as she observed dissident rioting.
Police Assistant Chief Constable Mark Hamilton condemned those indulging in disorder.
"The focus of this operation is ensuring the people of Creggan are safe however it is concerning to see significant numbers of young people on the streets, late into the night, throwing petrol bombs and other missiles at officers in the area," he said.
Sinn Fein Assembly member Karen Mullan said the security alert had caused significant disruption to local residents and she condemned the disorder.
© PAA 2019