The United States called on Wednesday for an international consensus to tackle the growing threat of cyber crime in financial services and other sectors, saying governments alone cannot tackle the problem. "We now need to develop consensus around ways to respond to this threat," U.S. Deputy Treasury Secretary Sarah Bloom Raskin told the CityWeek conference in London. Any solution will be suboptimal if governments act alone with the help of the financial services sector, she said. "There is no silver bullet," she said. Reaching a state of absolute cyber security is an unattainable goal. "Each of us must recognize this risk is perhaps the most pressing operational risk of our time," Raskin said.