The Tokyo Metropolitan Police Department into political group Tsubasa no To on Monday over alleged campaign obstruction activities in the April 28 Lower House by-election vote in Tokyo.

MPD investigators raided the party¡¯s headquarters in Tokyo¡¯s Chiyoda Ward, as well the homes of party leader Atsuhiko Kurokawa and Secretary-General Ryosuke Nemoto.

The group is suspected of interfering with the campaign activities of by-election candidates in Tokyo¡¯s No. 15 district ¡ª corresponding to the city¡¯s southeastern Koto Ward ¡ª in violation of the election law.