U.S. officials say hackers pose a threat to the nation’s economy and accuse China of carrying out the most cyber-attacks. “Attacks have been on the rise without question,” he said, explaining that, often, even experts can only guy where the attacks are coming from. “As for the vulnerabilities to the financial sector, I would assume that’s correct, but I would suggest that the vulnerabilities are throughout the U.S. economy,” he added. “The problem is that many people do not like to speak about these things because either they’re unaware they are being attacked or very reluctant to publicize their vulnerabilities.” The Washington Post says President Barack Obama is expected to issue an executive order on cyber security soon, intended to help private companies defend themselves against hacking.