Religion News Service reports that the annual peace service at Westminster Cathedral acquired fresh significance on Tuesday evening as Londoners gathered to pray for their city and other British communities torn by rioting. A fourth night of unrest brought total arrests in London to more than 700, and looting and arson continued to spread to other cities in Britain. One man has been reported killed and dozens of citizens and police officers have been injured, authorities said. The rioting began on Saturday after a peaceful demonstration in north London over the police killing of a 29-year-old man. One attendee mong the 200 people at the peace service said she needed a feeling of hope. "Faith gives hope that current fears and insecurities will pass and we will feel safe on the streets again and trust our young people," said Ellen Teague. For the first time, the Roman Catholic cathedral's liturgy mentioned those working for peace in inner cities. Pat Gaffney, general secretary of Pax Christi, led the service, saying, "let us pray that we may all become more aware of our responsibilities for what happens in the world around us and be prepared to take what action we can to promote good and prevent evil." There was an ecumenical flavor to the cathedral service as prayers of remembrance were offered for those who have given their lives in the cause of peace.