Prime Minister Keizo Obuchi visited a central Tokyo subway station Monday to mark the fifth anniversary of Aum Shinrikyo's nerve gas attack on the capital's subway system that killed 12 people in one of Japan's worst incidents of terrorism.

Obuchi bowed and placed a bouquet of white flowers at a memorial at Kasumigaseki Station.

"Again I feel deep anger at Aum Shinrikyo, which attacked innocent people five years ago, and offer my heartfelt condolences to the families of the 12 people who were killed," the prime minister told reporters afterward.