The haranguing phone calls have abated and fewer students at North Korean schools in Japan are the target of verbal or even physical abuse, but people still sense the resentment. The threatening e-mails to school authorities, graffiti and minor arson attacks against properties affiliated with the North Korean community spiked in July, when a volley of seven missiles was fired into the Sea of Japan, and again in October after Pyongyang conducted its first nuclear test. Today, the distrust and anger among the Japanese public is simmering, and is stirred by what North Koreans claim is unfair media coverage of events such as the ongoing investigation into allegations that medical equipment was illegally exported to Pyongyang. 'This forced investigation by the police is a purely political manoeuvre,' said Chong Tae-shik, a spokesman for Chongryun, the umbrella organisation for North Korean residents of Japan. 'I believe the government is using the search of our offices to try to obtain more information about our organisation and members. The case of the medical equipment is completely false.' Tokyo claims a Korean resident of Japan attempted to smuggle intravenous solutions aboard a ship bound for North Korea in May. The 60 bags of solution were supplied by a doctor without the appropriate documentation and are apparently used to treat people exposed to radiation. On Monday, police searched several sites in Tokyo, including Chongryun's headquarters in Bunkyo ward. Police are also investigating similar cases and links with the Korean Association of Science and Technology in Japan. Chongryun has about 150,000 members, although it refuses to give an exact figure. That may be because the number is declining. 'A lot of Koreans who used to be members of Chongryun are taking South Korean passports now because it is easier to do business,' said Kim Hea-ok, a film buyer from Kobe, who was born in North Korea. She switched allegiances when she married a South Korean and when Pyongyang admitted it abducted Japanese to train its spies. Today, she says that North Korea's actions put her family under suspicion. 'Anti-Korean graffiti was painted on the wall of my old school. Korean residents of Japan are victims of North Korea's actions, as well.'