OSAKA -- Health and Welfare Ministry narcotics agents have arrested a technical official with the National Police Agency on suspicion of buying amphetamines via the Internet, an Osaka office of the ministry said Wednesday.

Tetsuya Nishizaka, 27, of the NPA's Information Communications Bureau, bought 6 grams of drugs for about 60,000 yen from a man in his 20s in late March after contacting him over the Internet, according to the ministry's Office of Kinki District Narcotics Control Officers.

The ministry's narcotics officers investigated the NPA in connection with the case. The NPA said it was the first time the agency, which is in charge of Japan's police administration, has been the focus of a criminal case.