Greenpeace Japan criticized the Tokyo District Court Thursday for not clarifying reasons for the arrest and detention of three Greenpeace activists who staged a demonstration at the March 18 Tokyo Toy Show to protest the use of polyvinyl in toys.

The three activists from New Zealand and Australia were arrested for trespassing at Tokyo Big Site and interfering with business. But at Thursday's hearing to publicize the reason for their detention, the Tokyo District Court did not clarify who or what was damaged by the protest, the group's lawyer said at a press conference.

The three activists have been detained without bail for six days, he said, urging their immediate release.

Greenpeace has operated similar protests in Europe and the United States, but has experienced only one arrest, in which the detained member was released the same day, he said. The group also criticized the police raid on its office in Shibuya Ward on Tuesday.