Japanese nationals living on the mainland remained on alert yesterday, checking internet sites aimed at expatriates and keeping a low profile even though protests failed to materialise. Some Japanese residents said they felt safer than in the days following nationwide protests in April, after mainland policy shifted to cracking down on protests. The Japanese consulate in Shanghai yesterday repeated warnings for its citizens to take caution, even though by noon the mission had received no reports of protests in several cities including Nanjing , Ningbo and Wenzhou . 'We are all checking the websites,' said one Japanese national. 'We shouldn't act Japanese, loudly or openly, in public.' This week is a public holiday in both Japan and the mainland, so many Japanese people working in Shanghai have left on holiday while tourists have cancelled trips. Attendance at Shanghai's MotoGP motorcycle race over the weekend was down after Japanese fans returned their tickets out of security fears. Shanghai alone is home to at least 34,000 Japanese nationals and 4,500 companies. Some Japanese people living in the mainland have even said they are Korean to avoid trouble when asked about their nationality. Several Japanese businesses, including some owned and operated by Chinese, near the consulate closed over the Labour Day holiday. But some Japanese restaurants enjoyed booming business because of the break.