Police patrols have been stepped up at some Japanese institutions amid fears of a backlash from angry Diaoyu Islands activists. Possible targets include the Japanese Consulate, department stores and schools. While the Japanese Consulate said it had asked for police protection of its citizens, the police said they had stayed alert to potential problems since the protests over the islands began. 'The Commissioner of Police is concerned about and has instructions on the incident,' said Senior Assistant Commissioner (Operations) Benny Ng Ching-kwok. Some of the territory's Japanese schools have been advised to shelve outdoor activities. Parents have been told not to leave their children playing on streets alone following the death of David Chan. One Japanese mother in Taikoo Shing said yesterday the kindergarten her five-year-old son attended had warned her to be careful about their safety. 'I was told we should be careful these days because some Hong Kong people may think it is the Japanese who killed [David Chan],' she said. She said a school picnic to Tai Long Wan, Sai Kung, had been cancelled. Tsuguyoshi Hada, consul for information and culture, said officials had sent notices to the Hong Kong Japanese School and other kindergartens telling them to watch out for pupils' safety. Akihiro Kaku, principal of the Hong Kong Japanese School, said no extra guards had been deployed but 'parents and teachers are obviously concerned about the safety of their children'. Yoshiyuki Yoshioka, secretary-general to the Hong Kong Japanese Club, said the police asked him if the club needed assistance. He rejected it because he believed Hong Kong people were rational.