Groups of youths also lobbed more than a dozen petrol bombs from the Catholic-dominated Bogside area towards a Protestant neighborhood, police said.
Read more: All communities reject a return to violence in Northern Ireland
"For a fourth consecutive night police officers dealt with violence and disorder," Beck said. No officers were reported injured.
The night's events signal an uptick in violence ahead of a major July 12 parade staged annually by Pro-British Protestants to celebrate victory at the Battle of the Boyne in 1690. Many Catholics, however, see the marches as provocations.
Read more: Ireland warns Britain over hard border with North
Simmering tensionsDecades of sectarian conflict in Northern Ireland — between mostly Protestant loyalists who want to remain part of the UK and mostly Catholic republicans who want to be part of a united Ireland — were largely halted with the 1998 Good Friday Agreement. But persisting tensions between Protestant and Catholic communities still flare periodically.
In a rare joint statement on Wednesday, Northern Ireland's main Catholic and Protestant parties said "there must be a strong, clear and united voice against those who would engage in such disgraceful violence."
"As a society we must all stand with those who maintain law and order and who protect all sides of our community," the statement, co-signed by all the major Northern Irish parties, said.
nm/msh (Reuters, AP, dpa)
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