Despite the latest arrests Superintendent Dave Colbeck, of Nottingham police, renewed his appeal for witnesses to show courage in the face of intimidation. "If one or two people come forward it becomes a problem because of threats but if 100 people come forward the problem is theirs," he said. "There were a number of people in that car and we need to speak to these people. Some of them may or may not have known what was going to happen that night.